Perpetual benchmark thread... - Page 11

moebius · 2009-11-14, 08:13

AMD Phenom(tm) II X4 955 Processor
CPU speed: 3616.00 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, 3DNow!, MMX, SSE, SSE2
L1 cache size: 64 KB
L2 cache size: 512 KB, L3 cache size: 6 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
L1 TLBS: 48
L2 TLBS: 512
Prime95 32-bit version 25.9, RdtscTiming=1
Best time for 768K FFT length: 11.699 ms.
Best time for 896K FFT length: 14.233 ms.
Best time for 1024K FFT length: 16.163 ms.
Best time for 1280K FFT length: 20.475 ms.
Best time for 1536K FFT length: 24.505 ms.
Best time for 1792K FFT length: 30.001 ms.
Best time for 2048K FFT length: 33.958 ms.
Best time for 2560K FFT length: 44.735 ms.
Best time for 3072K FFT length: 53.441 ms.
Best time for 3584K FFT length: 64.947 ms.
Best time for 4096K FFT length: 73.566 ms.
Best time for 5120K FFT length: 97.125 ms.
Best time for 6144K FFT length: 122.152 ms.
Best time for 7168K FFT length: 151.038 ms.
Best time for 8192K FFT length: 172.531 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 8.468 ms.
Best time for 896K FFT length: 10.997 ms.
Best time for 1024K FFT length: 13.325 ms.
Best time for 1280K FFT length: 15.862 ms.
Best time for 1536K FFT length: 19.257 ms.
Best time for 1792K FFT length: 22.824 ms.
Best time for 2048K FFT length: 26.030 ms.
Best time for 2560K FFT length: 34.687 ms.
Best time for 3072K FFT length: 41.220 ms.
Best time for 3584K FFT length: 48.786 ms.
Best time for 4096K FFT length: 54.699 ms.
Best time for 5120K FFT length: 54.464 ms.
Best time for 6144K FFT length: 66.127 ms.
Best time for 7168K FFT length: 79.969 ms.
Best time for 8192K FFT length: 90.241 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 6.321 ms.
Best time for 896K FFT length: 7.336 ms.
Best time for 1024K FFT length: 8.395 ms.
Best time for 1280K FFT length: 14.364 ms.
Best time for 1536K FFT length: 16.925 ms.
Best time for 1792K FFT length: 19.806 ms.
Best time for 2048K FFT length: 22.407 ms.
Best time for 2560K FFT length: 30.807 ms.
Best time for 3072K FFT length: 36.088 ms.
Best time for 3584K FFT length: 41.646 ms.
Best time for 4096K FFT length: 46.496 ms.
Best time for 5120K FFT length: 38.431 ms.
Best time for 6144K FFT length: 46.875 ms.
Best time for 7168K FFT length: 56.333 ms.
Best time for 8192K FFT length: 63.816 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 5.813 ms.
Best time for 896K FFT length: 7.073 ms.
Best time for 1024K FFT length: 8.070 ms.
Best time for 1280K FFT length: 13.518 ms.
Best time for 1536K FFT length: 16.056 ms.
Best time for 1792K FFT length: 19.021 ms.
Best time for 2048K FFT length: 21.272 ms.
Best time for 2560K FFT length: 29.128 ms.
Best time for 3072K FFT length: 34.316 ms.
Best time for 3584K FFT length: 39.276 ms.
Best time for 4096K FFT length: 43.892 ms.
Best time for 5120K FFT length: 32.375 ms.
Best time for 6144K FFT length: 38.699 ms.
Best time for 7168K FFT length: 46.024 ms.
Best time for 8192K FFT length: 51.565 ms.
Best time for 58 bit trial factors: 3.211 ms.
Best time for 59 bit trial factors: 3.214 ms.
Best time for 60 bit trial factors: 3.234 ms.
Best time for 61 bit trial factors: 3.218 ms.
Best time for 62 bit trial factors: 3.224 ms.
Best time for 63 bit trial factors: 5.929 ms.
Best time for 64 bit trial factors: 5.921 ms.
Best time for 65 bit trial factors: 5.907 ms.
Best time for 66 bit trial factors: 5.862 ms.
Best time for 67 bit trial factors: 5.876 ms.

lycorn · 2009-11-16, 11:55

As we have been made aware by many benchmarks already posted in this forum, Prime 95 doesn´t scale very well as the number of threads per test goes up. That´s an established fact.
Now what would be interesting to post, in my opinion, is the per iteration times when the number of worker windows (each one single threaded) goes up. That gives a good indication of whether we should use a given multi core CPU just for LL work (one test per core). If the iteration times are getting real worse with more workers running, it is then probably better to switch on or two cores to TF, for example.
As far as I could see, this type of benchmark hasn´t been posted much. I therefore suggest that we start posting this type of data, particularly for quad cores.

garo · 2009-11-17, 22:42

At stock with memory running at 1333/CL9

Code:

Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
CPU speed: 2664.86 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 14.15 ms.
Best time for 896K FFT length: 17.28 ms.
Best time for 1024K FFT length: 19.61 ms.
Best time for 1280K FFT length: 24.53 ms.
Best time for 1536K FFT length: 29.38 ms.
Best time for 1792K FFT length: 35.82 ms.
Best time for 2048K FFT length: 40.49 ms.
Best time for 2560K FFT length: 53.61 ms.
Best time for 3072K FFT length: 64.92 ms.
Best time for 3584K FFT length: 79.34 ms.
Best time for 4096K FFT length: 89.47 ms.
Best time for 5120K FFT length: 114.79 ms.
Best time for 6144K FFT length: 136.35 ms.
Best time for 7168K FFT length: 166.41 ms.
Best time for 8192K FFT length: 186.84 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 7.47 ms.
Best time for 896K FFT length: 9.03 ms.
Best time for 1024K FFT length: 10.51 ms.
Best time for 1280K FFT length: 12.83 ms.
Best time for 1536K FFT length: 15.53 ms.
Best time for 1792K FFT length: 18.86 ms.
Best time for 2048K FFT length: 21.32 ms.
Best time for 2560K FFT length: 27.90 ms.
Best time for 3072K FFT length: 33.60 ms.
Best time for 3584K FFT length: 40.83 ms.
Best time for 4096K FFT length: 46.09 ms.
Best time for 5120K FFT length: 59.06 ms.
Best time for 6144K FFT length: 70.40 ms.
Best time for 7168K FFT length: 85.81 ms.
Best time for 8192K FFT length: 96.68 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 5.86 ms.
Best time for 896K FFT length: 6.73 ms.
Best time for 1024K FFT length: 8.83 ms.
Best time for 1280K FFT length: 8.68 ms.
Best time for 1536K FFT length: 10.36 ms.
Best time for 1792K FFT length: 12.69 ms.
Best time for 2048K FFT length: 14.29 ms.
Best time for 2560K FFT length: 18.75 ms.
Best time for 3072K FFT length: 22.73 ms.
Best time for 3584K FFT length: 27.81 ms.
Best time for 4096K FFT length: 31.50 ms.
Best time for 5120K FFT length: 40.80 ms.
Best time for 6144K FFT length: 51.13 ms.
Best time for 7168K FFT length: 61.64 ms.
Best time for 8192K FFT length: 70.36 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 5.22 ms.
Best time for 896K FFT length: 5.89 ms.
Best time for 1024K FFT length: 7.87 ms.
Best time for 1280K FFT length: 7.16 ms.
Best time for 1536K FFT length: 8.45 ms.
Best time for 1792K FFT length: 9.71 ms.
Best time for 2048K FFT length: 11.02 ms.
Best time for 2560K FFT length: 14.34 ms.
Best time for 3072K FFT length: 17.35 ms.
Best time for 3584K FFT length: 21.09 ms.
Best time for 4096K FFT length: 23.86 ms.
Best time for 5120K FFT length: 30.74 ms.
Best time for 6144K FFT length: 37.98 ms.
Best time for 7168K FFT length: 47.99 ms.
Best time for 8192K FFT length: 56.25 ms.
Best time for 58 bit trial factors: 3.58 ms.
Best time for 59 bit trial factors: 3.59 ms.
Best time for 60 bit trial factors: 3.56 ms.
Best time for 61 bit trial factors: 3.57 ms.
Best time for 62 bit trial factors: 3.59 ms.
Best time for 63 bit trial factors: 5.98 ms.
Best time for 64 bit trial factors: 5.96 ms.
Best time for 65 bit trial factors: 5.51 ms.
Best time for 66 bit trial factors: 5.46 ms.
Best time for 67 bit trial factors: 5.43 ms.

And at 3666MHz with memory at 1464/CL9

Code:

Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
CPU speed: 3660.04 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 10.35 ms.
Best time for 896K FFT length: 12.59 ms.
Best time for 1024K FFT length: 14.33 ms.
Best time for 1280K FFT length: 17.93 ms.
Best time for 1536K FFT length: 21.39 ms.
Best time for 1792K FFT length: 26.13 ms.
Best time for 2048K FFT length: 29.56 ms.
Best time for 2560K FFT length: 39.15 ms.
Best time for 3072K FFT length: 47.41 ms.
Best time for 3584K FFT length: 57.93 ms.
Best time for 4096K FFT length: 65.52 ms.
Best time for 5120K FFT length: 83.85 ms.
Best time for 6144K FFT length: 99.84 ms.
Best time for 7168K FFT length: 121.42 ms.
Best time for 8192K FFT length: 136.35 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 5.44 ms.
Best time for 896K FFT length: 6.57 ms.
Best time for 1024K FFT length: 7.67 ms.
Best time for 1280K FFT length: 9.36 ms.
Best time for 1536K FFT length: 11.25 ms.
Best time for 1792K FFT length: 13.68 ms.
Best time for 2048K FFT length: 15.57 ms.
Best time for 2560K FFT length: 20.30 ms.
Best time for 3072K FFT length: 24.37 ms.
Best time for 3584K FFT length: 29.75 ms.
Best time for 4096K FFT length: 33.64 ms.
Best time for 5120K FFT length: 43.27 ms.
Best time for 6144K FFT length: 51.29 ms.
Best time for 7168K FFT length: 62.47 ms.
Best time for 8192K FFT length: 70.48 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 4.25 ms.
Best time for 896K FFT length: 4.83 ms.
Best time for 1024K FFT length: 6.47 ms.
Best time for 1280K FFT length: 6.35 ms.
Best time for 1536K FFT length: 7.58 ms.
Best time for 1792K FFT length: 9.28 ms.
Best time for 2048K FFT length: 10.45 ms.
Best time for 2560K FFT length: 13.74 ms.
Best time for 3072K FFT length: 16.62 ms.
Best time for 3584K FFT length: 20.32 ms.
Best time for 4096K FFT length: 23.01 ms.
Best time for 5120K FFT length: 29.85 ms.
Best time for 6144K FFT length: 35.38 ms.
Best time for 7168K FFT length: 44.97 ms.
Best time for 8192K FFT length: 51.61 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 3.79 ms.
Best time for 896K FFT length: 4.31 ms.
Best time for 1024K FFT length: 5.76 ms.
Best time for 1280K FFT length: 5.23 ms.
Best time for 1536K FFT length: 6.19 ms.
Best time for 1792K FFT length: 7.11 ms.
Best time for 2048K FFT length: 8.08 ms.
Best time for 2560K FFT length: 10.46 ms.
Best time for 3072K FFT length: 12.74 ms.
Best time for 3584K FFT length: 15.56 ms.
Best time for 4096K FFT length: 17.52 ms.
Best time for 5120K FFT length: 22.60 ms.
Best time for 6144K FFT length: 27.91 ms.
Best time for 7168K FFT length: 35.09 ms.
Best time for 8192K FFT length: 41.31 ms.
Best time for 58 bit trial factors: 2.66 ms.
Best time for 59 bit trial factors: 2.66 ms.
Best time for 60 bit trial factors: 2.67 ms.
Best time for 61 bit trial factors: 2.66 ms.
Best time for 62 bit trial factors: 2.67 ms.
Best time for 63 bit trial factors: 4.48 ms.
Best time for 64 bit trial factors: 4.47 ms.
Best time for 65 bit trial factors: 4.11 ms.
Best time for 66 bit trial factors: 4.09 ms.
Best time for 67 bit trial factors: 4.08 ms.

S485122 · 2009-11-18, 06:44

Quote:

Originally Posted by lycorn

As we have been made aware by many benchmarks already posted in this forum, Prime 95 doesn´t scale very well as the number of threads per test goes up. That´s an established fact.

Looking at Garo's benchmark that seems not to be true any more with Intel's i5 (and i7) architecture that seems to have the necessary memory bandwidth : the slowdown for 4 threads is less than 10 % for FFT sizes from 1792 KB to 5120 KB.

But I agree that benchmarks with 4 different tests in parallel would be very interesting and would probably suffer less from inter core communication bottlenecks.

Jacob

ddrcoder · 2009-12-07, 08:41

Code:

Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz
CPU speed: 4000.57 MHz, 8 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 9.266 ms.
Best time for 896K FFT length: 11.204 ms.
Best time for 1024K FFT length: 12.638 ms.
Best time for 1280K FFT length: 15.924 ms.
Best time for 1536K FFT length: 19.222 ms.
Best time for 1792K FFT length: 23.175 ms.
Best time for 2048K FFT length: 26.320 ms.
Best time for 2560K FFT length: 34.907 ms.
Best time for 3072K FFT length: 42.681 ms.
Best time for 3584K FFT length: 53.006 ms.
Best time for 4096K FFT length: 60.267 ms.
Best time for 5120K FFT length: 78.897 ms.
Best time for 6144K FFT length: 95.181 ms.
Best time for 7168K FFT length: 113.431 ms.
Best time for 8192K FFT length: 126.381 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 9.518 ms.
Best time for 896K FFT length: 11.626 ms.
Best time for 1024K FFT length: 13.199 ms.
Best time for 1280K FFT length: 16.694 ms.
Best time for 1536K FFT length: 19.680 ms.
Best time for 1792K FFT length: 24.364 ms.
Best time for 2048K FFT length: 26.707 ms.
Best time for 2560K FFT length: 36.093 ms.
Best time for 3072K FFT length: 43.220 ms.
Best time for 3584K FFT length: 53.049 ms.
Best time for 4096K FFT length: 59.357 ms.
Best time for 5120K FFT length: 76.321 ms.
Best time for 6144K FFT length: 90.497 ms.
Best time for 7168K FFT length: 110.513 ms.
Best time for 8192K FFT length: 124.799 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 5.686 ms.
Best time for 896K FFT length: 6.757 ms.
Best time for 1024K FFT length: 8.336 ms.
Best time for 1280K FFT length: 9.638 ms.
Best time for 1536K FFT length: 11.501 ms.
Best time for 1792K FFT length: 14.196 ms.
Best time for 2048K FFT length: 15.756 ms.
Best time for 2560K FFT length: 21.240 ms.
Best time for 3072K FFT length: 25.777 ms.
Best time for 3584K FFT length: 32.232 ms.
Best time for 4096K FFT length: 35.000 ms.
Best time for 5120K FFT length: 47.109 ms.
Best time for 6144K FFT length: 55.998 ms.
Best time for 7168K FFT length: 69.900 ms.
Best time for 8192K FFT length: 75.467 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 5.499 ms.
Best time for 896K FFT length: 6.288 ms.
Best time for 1024K FFT length: 7.887 ms.
Best time for 1280K FFT length: 8.578 ms.
Best time for 1536K FFT length: 10.335 ms.
Best time for 1792K FFT length: 12.518 ms.
Best time for 2048K FFT length: 14.224 ms.
Best time for 2560K FFT length: 18.826 ms.
Best time for 3072K FFT length: 22.426 ms.
Best time for 3584K FFT length: 27.961 ms.
Best time for 4096K FFT length: 30.933 ms.
Best time for 5120K FFT length: 39.876 ms.
Best time for 6144K FFT length: 47.999 ms.
Best time for 7168K FFT length: 57.854 ms.
Best time for 8192K FFT length: 66.055 ms.
Timing FFTs using 5 threads.
Best time for 768K FFT length: 4.488 ms.
Best time for 896K FFT length: 5.160 ms.
Best time for 1024K FFT length: 6.623 ms.
Best time for 1280K FFT length: 6.668 ms.
Best time for 1536K FFT length: 8.123 ms.
Best time for 1792K FFT length: 9.596 ms.
Best time for 2048K FFT length: 10.578 ms.
Best time for 2560K FFT length: 13.718 ms.
Best time for 3072K FFT length: 18.062 ms.
Best time for 3584K FFT length: 21.984 ms.
Best time for 4096K FFT length: 24.084 ms.
Best time for 5120K FFT length: 30.709 ms.
Best time for 6144K FFT length: 38.574 ms.
Best time for 7168K FFT length: 47.016 ms.
Best time for 8192K FFT length: 51.522 ms.
Timing FFTs using 6 threads.
Best time for 768K FFT length: 4.656 ms.
Best time for 896K FFT length: 5.373 ms.
Best time for 1024K FFT length: 6.885 ms.
Best time for 1280K FFT length: 7.006 ms.
Best time for 1536K FFT length: 8.338 ms.
Best time for 1792K FFT length: 9.744 ms.
Best time for 2048K FFT length: 11.020 ms.
Best time for 2560K FFT length: 14.579 ms.
Best time for 3072K FFT length: 17.405 ms.
Best time for 3584K FFT length: 19.175 ms.
Best time for 4096K FFT length: 22.716 ms.
Best time for 5120K FFT length: 29.786 ms.
Best time for 6144K FFT length: 38.219 ms.
Best time for 7168K FFT length: 43.411 ms.
Best time for 8192K FFT length: 51.469 ms.
Timing FFTs using 7 threads.
Best time for 768K FFT length: 4.078 ms.
Best time for 896K FFT length: 4.689 ms.
Best time for 1024K FFT length: 6.161 ms.
Best time for 1280K FFT length: 6.172 ms.
Best time for 1536K FFT length: 7.292 ms.
Best time for 1792K FFT length: 8.919 ms.
Best time for 2048K FFT length: 10.716 ms.
Best time for 2560K FFT length: 12.957 ms.
Best time for 3072K FFT length: 17.096 ms.
Best time for 3584K FFT length: 19.252 ms.
Best time for 4096K FFT length: 22.945 ms.
Best time for 5120K FFT length: 28.873 ms.
Best time for 6144K FFT length: 35.850 ms.
Best time for 7168K FFT length: 42.036 ms.
Best time for 8192K FFT length: 50.448 ms.
Timing FFTs using 8 threads.
Best time for 768K FFT length: 4.302 ms.
Best time for 896K FFT length: 5.028 ms.
Best time for 1024K FFT length: 7.563 ms.
Best time for 1280K FFT length: 6.492 ms.
Best time for 1536K FFT length: 8.089 ms.
Best time for 1792K FFT length: 9.137 ms.
Best time for 2048K FFT length: 10.814 ms.
Best time for 2560K FFT length: 14.614 ms.
Best time for 3072K FFT length: 17.795 ms.
Best time for 3584K FFT length: 18.635 ms.
Best time for 4096K FFT length: 22.511 ms.
Best time for 5120K FFT length: 27.932 ms.
Best time for 6144K FFT length: 35.777 ms.
Best time for 7168K FFT length: 45.743 ms.
Best time for 8192K FFT length: 49.979 ms.
Best time for 58 bit trial factors: 1.937 ms.
Best time for 59 bit trial factors: 1.963 ms.
Best time for 60 bit trial factors: 1.962 ms.
Best time for 61 bit trial factors: 2.166 ms.
Best time for 62 bit trial factors: 2.288 ms.
Best time for 63 bit trial factors: 2.705 ms.
Best time for 64 bit trial factors: 3.327 ms.
Best time for 65 bit trial factors: 3.504 ms.
Best time for 66 bit trial factors: 3.691 ms.
Best time for 67 bit trial factors: 3.665 ms.

ddrcoder · 2009-12-07, 08:46

I improved the ventilation a bit around the CPU, now it made it through the test without downclocking:

Code:

Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz
CPU speed: 4000.24 MHz, 8 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 9.247 ms.
Best time for 896K FFT length: 11.191 ms.
Best time for 1024K FFT length: 12.608 ms.
Best time for 1280K FFT length: 15.878 ms.
Best time for 1536K FFT length: 19.166 ms.
Best time for 1792K FFT length: 23.123 ms.
Best time for 2048K FFT length: 26.119 ms.
Best time for 2560K FFT length: 34.800 ms.
Best time for 3072K FFT length: 42.541 ms.
Best time for 3584K FFT length: 51.684 ms.
Best time for 4096K FFT length: 58.141 ms.
Best time for 5120K FFT length: 74.773 ms.
Best time for 6144K FFT length: 88.944 ms.
Best time for 7168K FFT length: 108.168 ms.
Best time for 8192K FFT length: 121.921 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 9.478 ms.
Best time for 896K FFT length: 11.564 ms.
Best time for 1024K FFT length: 13.002 ms.
Best time for 1280K FFT length: 16.511 ms.
Best time for 1536K FFT length: 19.684 ms.
Best time for 1792K FFT length: 24.132 ms.
Best time for 2048K FFT length: 26.784 ms.
Best time for 2560K FFT length: 35.635 ms.
Best time for 3072K FFT length: 42.333 ms.
Best time for 3584K FFT length: 51.944 ms.
Best time for 4096K FFT length: 57.433 ms.
Best time for 5120K FFT length: 74.338 ms.
Best time for 6144K FFT length: 88.665 ms.
Best time for 7168K FFT length: 107.472 ms.
Best time for 8192K FFT length: 119.232 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 5.586 ms.
Best time for 896K FFT length: 6.711 ms.
Best time for 1024K FFT length: 8.235 ms.
Best time for 1280K FFT length: 9.600 ms.
Best time for 1536K FFT length: 11.387 ms.
Best time for 1792K FFT length: 14.047 ms.
Best time for 2048K FFT length: 15.440 ms.
Best time for 2560K FFT length: 20.835 ms.
Best time for 3072K FFT length: 24.836 ms.
Best time for 3584K FFT length: 30.593 ms.
Best time for 4096K FFT length: 33.869 ms.
Best time for 5120K FFT length: 43.959 ms.
Best time for 6144K FFT length: 52.436 ms.
Best time for 7168K FFT length: 63.801 ms.
Best time for 8192K FFT length: 70.626 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 5.472 ms.
Best time for 896K FFT length: 6.303 ms.
Best time for 1024K FFT length: 7.866 ms.
Best time for 1280K FFT length: 8.577 ms.
Best time for 1536K FFT length: 10.323 ms.
Best time for 1792K FFT length: 12.427 ms.
Best time for 2048K FFT length: 13.874 ms.
Best time for 2560K FFT length: 18.216 ms.
Best time for 3072K FFT length: 21.769 ms.
Best time for 3584K FFT length: 26.342 ms.
Best time for 4096K FFT length: 29.446 ms.
Best time for 5120K FFT length: 37.931 ms.
Best time for 6144K FFT length: 45.583 ms.
Best time for 7168K FFT length: 55.053 ms.
Best time for 8192K FFT length: 61.405 ms.
Timing FFTs using 5 threads.
Best time for 768K FFT length: 4.440 ms.
Best time for 896K FFT length: 5.085 ms.
Best time for 1024K FFT length: 6.593 ms.
Best time for 1280K FFT length: 6.649 ms.
Best time for 1536K FFT length: 7.895 ms.
Best time for 1792K FFT length: 9.247 ms.
Best time for 2048K FFT length: 10.365 ms.
Best time for 2560K FFT length: 13.547 ms.
Best time for 3072K FFT length: 16.214 ms.
Best time for 3584K FFT length: 19.759 ms.
Best time for 4096K FFT length: 22.091 ms.
Best time for 5120K FFT length: 28.841 ms.
Best time for 6144K FFT length: 35.322 ms.
Best time for 7168K FFT length: 42.786 ms.
Best time for 8192K FFT length: 47.855 ms.
Timing FFTs using 6 threads.
Best time for 768K FFT length: 4.596 ms.
Best time for 896K FFT length: 5.310 ms.
Best time for 1024K FFT length: 6.823 ms.
Best time for 1280K FFT length: 6.919 ms.
Best time for 1536K FFT length: 8.274 ms.
Best time for 1792K FFT length: 9.625 ms.
Best time for 2048K FFT length: 10.901 ms.
Best time for 2560K FFT length: 13.528 ms.
Best time for 3072K FFT length: 16.194 ms.
Best time for 3584K FFT length: 18.895 ms.
Best time for 4096K FFT length: 21.474 ms.
Best time for 5120K FFT length: 26.673 ms.
Best time for 6144K FFT length: 34.034 ms.
Best time for 7168K FFT length: 40.747 ms.
Best time for 8192K FFT length: 46.290 ms.
Timing FFTs using 7 threads.
Best time for 768K FFT length: 4.149 ms.
Best time for 896K FFT length: 4.667 ms.
Best time for 1024K FFT length: 6.053 ms.
Best time for 1280K FFT length: 6.053 ms.
Best time for 1536K FFT length: 7.231 ms.
Best time for 1792K FFT length: 8.351 ms.
Best time for 2048K FFT length: 9.558 ms.
Best time for 2560K FFT length: 11.851 ms.
Best time for 3072K FFT length: 14.100 ms.
Best time for 3584K FFT length: 16.415 ms.
Best time for 4096K FFT length: 18.702 ms.
Best time for 5120K FFT length: 23.265 ms.
Best time for 6144K FFT length: 29.802 ms.
Best time for 7168K FFT length: 36.410 ms.
Best time for 8192K FFT length: 41.644 ms.
Timing FFTs using 8 threads.
Best time for 768K FFT length: 4.225 ms.
Best time for 896K FFT length: 4.860 ms.
Best time for 1024K FFT length: 6.253 ms.
Best time for 1280K FFT length: 6.313 ms.
Best time for 1536K FFT length: 7.613 ms.
Best time for 1792K FFT length: 8.712 ms.
Best time for 2048K FFT length: 10.017 ms.
Best time for 2560K FFT length: 12.383 ms.
Best time for 3072K FFT length: 14.907 ms.
Best time for 3584K FFT length: 17.200 ms.
Best time for 4096K FFT length: 19.694 ms.
Best time for 5120K FFT length: 24.571 ms.
Best time for 6144K FFT length: 30.808 ms.
Best time for 7168K FFT length: 37.385 ms.
Best time for 8192K FFT length: 43.127 ms.
Best time for 58 bit trial factors: 1.934 ms.
Best time for 59 bit trial factors: 1.956 ms.
Best time for 60 bit trial factors: 1.957 ms.
Best time for 61 bit trial factors: 2.159 ms.
Best time for 62 bit trial factors: 2.283 ms.
Best time for 63 bit trial factors: 2.698 ms.
Best time for 64 bit trial factors: 3.328 ms.
Best time for 65 bit trial factors: 3.512 ms.
Best time for 66 bit trial factors: 3.678 ms.
Best time for 67 bit trial factors: 3.651 ms.

R.D. Silverman · 2009-12-07, 12:30

Quote:

Originally Posted by S485122

Looking at Garo's benchmark that seems not to be true any more with Intel's i5 (and i7) architecture that seems to have the necessary memory bandwidth : the slowdown for 4 threads is less than 10 % for FFT sizes from 1792 KB to 5120 KB.

But I agree that benchmarks with 4 different tests in parallel would be very interesting and would probably suffer less from inter core communication bottlenecks.

Jacob

I just bought a new toy: an I7/920 with 12Gbytes.
This is a 4-core machine with HT @2.66GHz. I could have bought one
at 3.3Ghz, but the cost was 60% higher for only 25% more speed.
(another $600 for the i7/975)

I have benchmark data for SNFS with my current number: 2,1149-
The factor bases are each 2.8million ideals, the sieve region is 8K x 16K,
and the LP bound is 800Million (i.e. betweeen 29 and 30 bits)

The data given is the number of special-q's processed per minute.

1 core; 7.4
2 : 15
3 : 22
4 : 29
5 : 31.5
6 : 34
7 : 37
8 : 40

This is for code compiled as 32-bit code. I intend to recompile as 64-bit.
However, I am busy with 60 hour weeks on my real job, so this will take
a while.

starrynte · 2009-12-23, 01:14

Code:

[Mon Dec 21 11:46:07 2009]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
CPU speed: 2660.19 MHz, 2 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.9, RdtscTiming=1
Best time for 768K FFT length: 11.604 ms.
Best time for 896K FFT length: 14.140 ms.
Best time for 1024K FFT length: 15.979 ms.
Best time for 1280K FFT length: 20.101 ms.
Best time for 1536K FFT length: 24.264 ms.
Best time for 1792K FFT length: 29.377 ms.
Best time for 2048K FFT length: 33.267 ms.
Best time for 2560K FFT length: 44.351 ms.
Best time for 3072K FFT length: 54.405 ms.
Best time for 3584K FFT length: 65.842 ms.
Best time for 4096K FFT length: 74.242 ms.
Best time for 5120K FFT length: 95.047 ms.
Best time for 6144K FFT length: 113.294 ms.
Best time for 7168K FFT length: 138.047 ms.
Best time for 8192K FFT length: 155.555 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 6.152 ms.
Best time for 896K FFT length: 7.403 ms.
Best time for 1024K FFT length: 8.465 ms.
Best time for 1280K FFT length: 10.617 ms.
Best time for 1536K FFT length: 12.875 ms.
Best time for 1792K FFT length: 15.602 ms.
Best time for 2048K FFT length: 17.595 ms.
Best time for 2560K FFT length: 23.082 ms.
Best time for 3072K FFT length: 27.964 ms.
Best time for 3584K FFT length: 33.929 ms.
Best time for 4096K FFT length: 38.249 ms.
Best time for 5120K FFT length: 49.172 ms.
Best time for 6144K FFT length: 59.253 ms.
Best time for 7168K FFT length: 73.083 ms.
Best time for 8192K FFT length: 82.076 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 4.839 ms.
Best time for 896K FFT length: 5.510 ms.
Best time for 1024K FFT length: 7.375 ms.
Best time for 1280K FFT length: 6.883 ms.
Best time for 1536K FFT length: 8.144 ms.
Best time for 1792K FFT length: 9.401 ms.
Best time for 2048K FFT length: 10.752 ms.
Best time for 2560K FFT length: 13.527 ms.
Best time for 3072K FFT length: 16.757 ms.
Best time for 3584K FFT length: 19.925 ms.
Best time for 4096K FFT length: 22.849 ms.
Best time for 5120K FFT length: 29.466 ms.
Best time for 6144K FFT length: 39.497 ms.
Best time for 7168K FFT length: 47.455 ms.
Best time for 8192K FFT length: 55.049 ms.
Best time for 58 bit trial factors: 2.428 ms.
Best time for 59 bit trial factors: 2.455 ms.
Best time for 60 bit trial factors: 2.479 ms.
Best time for 61 bit trial factors: 2.737 ms.
Best time for 62 bit trial factors: 2.877 ms.
Best time for 63 bit trial factors: 3.383 ms.
Best time for 64 bit trial factors: 4.177 ms.
Best time for 65 bit trial factors: 4.417 ms.
Best time for 66 bit trial factors: 4.626 ms.
Best time for 67 bit trial factors: 4.576 ms.

(Prime95 incorrectly thinks I have 2 hyperthreaded cores (actually 4 physical cores))
Note that the times for 1 and 2 threads may be faster than expected due to turbo boost

Mini-Geek · 2009-12-23, 03:54

Quote:

Originally Posted by starrynte

(Prime95 incorrectly thinks I have 2 hyperthreaded cores (actually 4 physical cores))

Here's a way to override it and make it know what the CPU really is: (from undoc.txt)

Code:

The program automatically computes the number of CPUs, hyperthreading, and speed.
This information is used to calculate how much work to get.
If the program did not correctly figure out your CPU information,
you can override the info in local.txt:
    NumCPUs=n
    CpuNumHyperthreads=1 or 2
    CpuSpeed=s
Where n is the number of physical CPUs or cores, not logical CPUs created by
hyperthreading. Choose 1 for non-hyperthreaded and 2 for hyperthreaded. Finally,
s is the speed in MHz.

(yes, I know there's a possibility that you already knew this, and were pointing it out as a bug needing fixing...just figured it might help)

hj47 · 2010-01-16, 03:29

Code:

[Sat Jan 16 14:23:00 2010]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i5 CPU         750  @ 2.67GHz
CPU speed: 3200.00 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.9, RdtscTiming=1
Best time for 768K FFT length: 11.587 ms.
Best time for 896K FFT length: 14.058 ms.
Best time for 1024K FFT length: 15.821 ms.
Best time for 1280K FFT length: 19.929 ms.
Best time for 1536K FFT length: 24.000 ms.
Best time for 1792K FFT length: 29.000 ms.
Best time for 2048K FFT length: 32.711 ms.
Best time for 2560K FFT length: 43.344 ms.
Best time for 3072K FFT length: 52.723 ms.
Best time for 3584K FFT length: 64.006 ms.
Best time for 4096K FFT length: 72.155 ms.
Best time for 5120K FFT length: 92.282 ms.
Best time for 6144K FFT length: 110.128 ms.
Best time for 7168K FFT length: 134.087 ms.
Best time for 8192K FFT length: 150.194 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 6.040 ms.
Best time for 896K FFT length: 7.331 ms.
Best time for 1024K FFT length: 8.382 ms.
Best time for 1280K FFT length: 10.397 ms.
Best time for 1536K FFT length: 12.526 ms.
Best time for 1792K FFT length: 15.116 ms.
Best time for 2048K FFT length: 17.055 ms.
Best time for 2560K FFT length: 22.350 ms.
Best time for 3072K FFT length: 27.049 ms.
Best time for 3584K FFT length: 32.737 ms.
Best time for 4096K FFT length: 36.823 ms.
Best time for 5120K FFT length: 47.122 ms.
Best time for 6144K FFT length: 56.323 ms.
Best time for 7168K FFT length: 68.502 ms.
Best time for 8192K FFT length: 76.710 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 4.719 ms.
Best time for 896K FFT length: 5.320 ms.
Best time for 1024K FFT length: 7.018 ms.
Best time for 1280K FFT length: 7.032 ms.
Best time for 1536K FFT length: 8.427 ms.
Best time for 1792K FFT length: 10.221 ms.
Best time for 2048K FFT length: 11.446 ms.
Best time for 2560K FFT length: 15.141 ms.
Best time for 3072K FFT length: 18.297 ms.
Best time for 3584K FFT length: 22.220 ms.
Best time for 4096K FFT length: 25.163 ms.
Best time for 5120K FFT length: 32.006 ms.
Best time for 6144K FFT length: 38.256 ms.
Best time for 7168K FFT length: 46.596 ms.
Best time for 8192K FFT length: 52.521 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 4.173 ms.
Best time for 896K FFT length: 4.696 ms.
Best time for 1024K FFT length: 6.224 ms.
Best time for 1280K FFT length: 5.876 ms.
Best time for 1536K FFT length: 7.000 ms.
Best time for 1792K FFT length: 8.099 ms.
Best time for 2048K FFT length: 9.215 ms.
Best time for 2560K FFT length: 11.506 ms.
Best time for 3072K FFT length: 13.909 ms.
Best time for 3584K FFT length: 16.817 ms.
Best time for 4096K FFT length: 18.955 ms.
Best time for 5120K FFT length: 24.315 ms.
Best time for 6144K FFT length: 29.556 ms.
Best time for 7168K FFT length: 36.312 ms.
Best time for 8192K FFT length: 41.955 ms.
Best time for 58 bit trial factors: 2.421 ms.
Best time for 59 bit trial factors: 2.451 ms.
Best time for 60 bit trial factors: 2.449 ms.
Best time for 61 bit trial factors: 2.731 ms.
Best time for 62 bit trial factors: 2.857 ms.
Best time for 63 bit trial factors: 3.371 ms.
Best time for 64 bit trial factors: 4.121 ms.
Best time for 65 bit trial factors: 4.396 ms.
Best time for 66 bit trial factors: 4.601 ms.
Best time for 67 bit trial factors: 4.569 ms.

hj47 · 2010-03-02, 05:24

Code:

 
[Tue Mar 02 16:19:45 2010]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i5 CPU 750 @ 2.67GHz
CPU speed: 3600.00 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.9, RdtscTiming=1
Best time for 768K FFT length: 10.290 ms.
Best time for 896K FFT length: 12.511 ms.
Best time for 1024K FFT length: 14.059 ms.
Best time for 1280K FFT length: 17.697 ms.
Best time for 1536K FFT length: 21.340 ms.
Best time for 1792K FFT length: 25.805 ms.
Best time for 2048K FFT length: 29.111 ms.
Best time for 2560K FFT length: 38.653 ms.
Best time for 3072K FFT length: 47.120 ms.
Best time for 3584K FFT length: 57.132 ms.
Best time for 4096K FFT length: 64.416 ms.
Best time for 5120K FFT length: 82.394 ms.
Best time for 6144K FFT length: 98.321 ms.
Best time for 7168K FFT length: 119.650 ms.
Best time for 8192K FFT length: 134.385 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 5.376 ms.
Best time for 896K FFT length: 6.506 ms.
Best time for 1024K FFT length: 7.432 ms.
Best time for 1280K FFT length: 9.301 ms.
Best time for 1536K FFT length: 11.198 ms.
Best time for 1792K FFT length: 13.517 ms.
Best time for 2048K FFT length: 15.247 ms.
Best time for 2560K FFT length: 19.986 ms.
Best time for 3072K FFT length: 24.189 ms.
Best time for 3584K FFT length: 29.249 ms.
Best time for 4096K FFT length: 32.948 ms.
Best time for 5120K FFT length: 42.181 ms.
Best time for 6144K FFT length: 50.503 ms.
Best time for 7168K FFT length: 61.683 ms.
Best time for 8192K FFT length: 68.924 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 4.212 ms.
Best time for 896K FFT length: 4.663 ms.
Best time for 1024K FFT length: 6.274 ms.
Best time for 1280K FFT length: 6.284 ms.
Best time for 1536K FFT length: 7.545 ms.
Best time for 1792K FFT length: 9.162 ms.
Best time for 2048K FFT length: 10.280 ms.
Best time for 2560K FFT length: 13.537 ms.
Best time for 3072K FFT length: 16.419 ms.
Best time for 3584K FFT length: 19.979 ms.
Best time for 4096K FFT length: 22.601 ms.
Best time for 5120K FFT length: 28.552 ms.
Best time for 6144K FFT length: 36.026 ms.
Best time for 7168K FFT length: 42.251 ms.
Best time for 8192K FFT length: 47.758 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 3.719 ms.
Best time for 896K FFT length: 4.191 ms.
Best time for 1024K FFT length: 5.551 ms.
Best time for 1280K FFT length: 5.250 ms.
Best time for 1536K FFT length: 6.272 ms.
Best time for 1792K FFT length: 7.238 ms.
Best time for 2048K FFT length: 8.231 ms.
Best time for 2560K FFT length: 10.318 ms.
Best time for 3072K FFT length: 12.519 ms.
Best time for 3584K FFT length: 15.104 ms.
Best time for 4096K FFT length: 17.038 ms.
Best time for 5120K FFT length: 21.903 ms.
Best time for 6144K FFT length: 27.059 ms.
Best time for 7168K FFT length: 33.409 ms.
Best time for 8192K FFT length: 39.547 ms.
Best time for 58 bit trial factors: 2.152 ms.
Best time for 59 bit trial factors: 2.177 ms.
Best time for 60 bit trial factors: 2.174 ms.
Best time for 61 bit trial factors: 2.426 ms.
Best time for 62 bit trial factors: 2.538 ms.
Best time for 63 bit trial factors: 2.995 ms.
Best time for 64 bit trial factors: 3.681 ms.
Best time for 65 bit trial factors: 3.903 ms.
Best time for 66 bit trial factors: 4.088 ms.
Best time for 67 bit trial factors: 4.059 ms.

petrw1 · 2010-03-15, 05:00

I just installed Prime95 on:

Code:

Software Version Windows,Prime95,v25.9,build 4 
Model AMD Athlon Dual-Core QL-62 
Features Dual core, Prefetch,3DNow!,SSE,SSE2 
Speed 1.999 GHz (1.765 GHz P4 effective equivalent) 
L1/L2 Cache 64 / 512 KB 
Computer Memory 2814 MB   configured usage 1000 MB day / 1000 MB night 
--- it has 3 GB of RAM

I started with Worker 1: P-1; Worker 2: DC
The iterations times seemed high for a DC (0.130) so I ran a benchmark.
The results really surprised me.

With 1 core the numbers seemed low: i.e. 63 Ms for 1280 FFT
But when it went to 1 core/1 helper it got very weird: the iterations time went up by about 40% to about 80 ms for 1280FFT; and every other FFT below 7K (at which time they were slightly better than 1 core).

So I changed both cores to DC. With only 1 worker active running DC I was getting iterations times of about 70 ms. When the second DC worker started both iterations times dropped to 132 ms.

Task manager showed Prime95 consistently in the 98-99% range.

Any thoughts? Anyone help?

lycorn · 2010-03-15, 08:32

The QL-62 works with DDR2-667 (333 MHz Bus speed). It´s not much in terms of mem bandwith. I would say that might be the limiting factor in the benchies you posted. The way the numbers vary suggests some memory access congestion.

petrw1 · 2010-03-15, 14:31

Quote:

Originally Posted by lycorn

The QL-62 works with DDR2-667 (333 MHz Bus speed). It´s not much in terms of mem bandwith. I would say that might be the limiting factor in the benchies you posted. The way the numbers vary suggests some memory access congestion.

I just looked and there are 6 other benchmarks for the QL-62 are very close to mine ... that tells me this PC is working as expected and that it probably does NOT have a significant issue with spyware, viruses or overheating.

So maybe it is only/best suited for TF?

lycorn · 2010-03-15, 23:46

Try one core DC and one core TF.

petrw1 · 2010-04-06, 20:10

One the benchmark page there is a "Delete?" column but no corresponding "Delete" button or option.

Am I missing something OR is this feature not fully implemented yet?

lfm · 2010-04-07, 06:06

Quote:

Originally Posted by petrw1

One the benchmark page there is a "Delete?" column but no corresponding "Delete" button or option.

Am I missing something OR is this feature not fully implemented yet?

Ya, its implemented at a deeper level somewhere, I was confused by this at first too. The top level delete check boxes are non-functional.

retina · 2010-04-07, 06:17

Quote:

Originally Posted by lycorn

... Prime 95 doesn´t scale very well as the number of threads per test goes up.

Except for the i5, which scales very well up to at least 4 threads.

Quote:

Originally Posted by lycorn

That´s an established fact.

Okay.

Ethan (EO) · 2010-04-09, 08:30

Fry's was running an amazing deal last weekend -- an i3 540 _and_ a Gigabyte GA-H55-S2H motherboard for $99! This setup _really_ sips the juice. 50w at the wall at idle; <100w at the wall running two cores of Prime95 at stock speeds!!

First, at all stock settings (3067Mhz, DDR3 @ 1333 7-8-7-20):

Code:

Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz
CPU speed: 3066.52 MHz, 2 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 12.387 ms.
Best time for 896K FFT length: 14.989 ms.
Best time for 1024K FFT length: 16.901 ms.
Best time for 1280K FFT length: 21.208 ms.
Best time for 1536K FFT length: 25.692 ms.
Best time for 1792K FFT length: 31.144 ms.
Best time for 2048K FFT length: 35.157 ms.
Best time for 2560K FFT length: 46.960 ms.
Best time for 3072K FFT length: 57.195 ms.
Best time for 3584K FFT length: 69.764 ms.
Best time for 4096K FFT length: 78.350 ms.
Best time for 5120K FFT length: 100.083 ms.
Best time for 6144K FFT length: 119.215 ms.
Best time for 7168K FFT length: 145.379 ms.
Best time for 8192K FFT length: 163.474 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 12.583 ms.
Best time for 896K FFT length: 15.453 ms.
Best time for 1024K FFT length: 17.371 ms.
Best time for 1280K FFT length: 21.802 ms.
Best time for 1536K FFT length: 25.980 ms.
Best time for 1792K FFT length: 31.744 ms.
Best time for 2048K FFT length: 35.155 ms.
Best time for 2560K FFT length: 47.096 ms.
Best time for 3072K FFT length: 56.008 ms.
Best time for 3584K FFT length: 68.516 ms.
Best time for 4096K FFT length: 76.166 ms.
Best time for 5120K FFT length: 98.975 ms.
Best time for 6144K FFT length: 117.275 ms.
Best time for 7168K FFT length: 142.850 ms.
Best time for 8192K FFT length: 158.081 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 7.450 ms.
Best time for 896K FFT length: 8.471 ms.
Best time for 1024K FFT length: 10.633 ms.
Best time for 1280K FFT length: 11.381 ms.
Best time for 1536K FFT length: 13.620 ms.
Best time for 1792K FFT length: 16.463 ms.
Best time for 2048K FFT length: 18.384 ms.
Best time for 2560K FFT length: 24.125 ms.
Best time for 3072K FFT length: 28.849 ms.
Best time for 3584K FFT length: 35.145 ms.
Best time for 4096K FFT length: 39.371 ms.
Best time for 5120K FFT length: 50.950 ms.
Best time for 6144K FFT length: 61.788 ms.
Best time for 7168K FFT length: 74.383 ms.
Best time for 8192K FFT length: 83.557 ms.
Best time for 58 bit trial factors: 2.516 ms.
Best time for 59 bit trial factors: 2.556 ms.
Best time for 60 bit trial factors: 2.550 ms.
Best time for 61 bit trial factors: 2.886 ms.
Best time for 62 bit trial factors: 2.996 ms.
Best time for 63 bit trial factors: 3.531 ms.
Best time for 64 bit trial factors: 4.202 ms.
Best time for 65 bit trial factors: 4.595 ms.
Best time for 66 bit trial factors: 4.808 ms.
Best time for 67 bit trial factors: 4.769 ms.

To get the memory running at its rated speed, I needed to bump the processor to 3817Mhz:

Code:

Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz
CPU speed: 3817.86 MHz, 2 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 9.963 ms.
Best time for 896K FFT length: 12.072 ms.
Best time for 1024K FFT length: 13.597 ms.
Best time for 1280K FFT length: 17.072 ms.
Best time for 1536K FFT length: 20.644 ms.
Best time for 1792K FFT length: 25.015 ms.
Best time for 2048K FFT length: 28.244 ms.
Best time for 2560K FFT length: 37.690 ms.
Best time for 3072K FFT length: 45.874 ms.
Best time for 3584K FFT length: 55.708 ms.
Best time for 4096K FFT length: 62.867 ms.
Best time for 5120K FFT length: 80.396 ms.
Best time for 6144K FFT length: 95.853 ms.
Best time for 7168K FFT length: 119.901 ms.
Best time for 8192K FFT length: 131.654 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 10.064 ms.
Best time for 896K FFT length: 12.252 ms.
Best time for 1024K FFT length: 13.813 ms.
Best time for 1280K FFT length: 17.482 ms.
Best time for 1536K FFT length: 20.762 ms.
Best time for 1792K FFT length: 25.530 ms.
Best time for 2048K FFT length: 28.206 ms.
Best time for 2560K FFT length: 37.582 ms.
Best time for 3072K FFT length: 44.860 ms.
Best time for 3584K FFT length: 54.902 ms.
Best time for 4096K FFT length: 61.184 ms.
Best time for 5120K FFT length: 79.222 ms.
Best time for 6144K FFT length: 94.493 ms.
Best time for 7168K FFT length: 113.965 ms.
Best time for 8192K FFT length: 126.755 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 5.975 ms.
Best time for 896K FFT length: 6.798 ms.
Best time for 1024K FFT length: 8.534 ms.
Best time for 1280K FFT length: 9.124 ms.
Best time for 1536K FFT length: 10.930 ms.
Best time for 1792K FFT length: 13.218 ms.
Best time for 2048K FFT length: 14.702 ms.
Best time for 2560K FFT length: 19.393 ms.
Best time for 3072K FFT length: 23.332 ms.
Best time for 3584K FFT length: 28.273 ms.
Best time for 4096K FFT length: 31.663 ms.
Best time for 5120K FFT length: 40.983 ms.
Best time for 6144K FFT length: 49.574 ms.
Best time for 7168K FFT length: 59.864 ms.
Best time for 8192K FFT length: 68.706 ms.
Best time for 58 bit trial factors: 2.021 ms.
Best time for 59 bit trial factors: 2.055 ms.
Best time for 60 bit trial factors: 2.048 ms.
Best time for 61 bit trial factors: 2.315 ms.
Best time for 62 bit trial factors: 2.406 ms.
Best time for 63 bit trial factors: 2.836 ms.
Best time for 64 bit trial factors: 3.468 ms.
Best time for 65 bit trial factors: 3.676 ms.
Best time for 66 bit trial factors: 3.847 ms.
Best time for 67 bit trial factors: 3.817 ms.

Then I took it up a little further to 4645...

Code:

Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz
CPU speed: 4645.97 MHz, 2 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 8.244 ms.
Best time for 896K FFT length: 9.962 ms.
Best time for 1024K FFT length: 11.250 ms.
Best time for 1280K FFT length: 14.105 ms.
Best time for 1536K FFT length: 17.059 ms.
Best time for 1792K FFT length: 20.669 ms.
Best time for 2048K FFT length: 23.360 ms.
Best time for 2560K FFT length: 31.158 ms.
Best time for 3072K FFT length: 37.964 ms.
Best time for 3584K FFT length: 46.022 ms.
Best time for 4096K FFT length: 51.934 ms.
Best time for 5120K FFT length: 66.343 ms.
Best time for 6144K FFT length: 78.983 ms.
Best time for 7168K FFT length: 96.337 ms.
Best time for 8192K FFT length: 108.433 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 8.312 ms.
Best time for 896K FFT length: 10.092 ms.
Best time for 1024K FFT length: 11.337 ms.
Best time for 1280K FFT length: 14.378 ms.
Best time for 1536K FFT length: 17.124 ms.
Best time for 1792K FFT length: 20.984 ms.
Best time for 2048K FFT length: 23.187 ms.
Best time for 2560K FFT length: 30.812 ms.
Best time for 3072K FFT length: 36.981 ms.
Best time for 3584K FFT length: 45.192 ms.
Best time for 4096K FFT length: 50.635 ms.
Best time for 5120K FFT length: 65.189 ms.
Best time for 6144K FFT length: 77.511 ms.
Best time for 7168K FFT length: 94.302 ms.
Best time for 8192K FFT length: 104.387 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 4.927 ms.
Best time for 896K FFT length: 5.597 ms.
Best time for 1024K FFT length: 7.007 ms.
Best time for 1280K FFT length: 7.558 ms.
Best time for 1536K FFT length: 9.042 ms.
Best time for 1792K FFT length: 10.883 ms.
Best time for 2048K FFT length: 12.197 ms.
Best time for 2560K FFT length: 16.082 ms.
Best time for 3072K FFT length: 19.276 ms.
Best time for 3584K FFT length: 23.334 ms.
Best time for 4096K FFT length: 26.027 ms.
Best time for 5120K FFT length: 33.742 ms.
Best time for 6144K FFT length: 40.830 ms.
Best time for 7168K FFT length: 49.336 ms.
Best time for 8192K FFT length: 55.707 ms.
Best time for 58 bit trial factors: 1.661 ms.
Best time for 59 bit trial factors: 1.686 ms.
Best time for 60 bit trial factors: 1.683 ms.
Best time for 61 bit trial factors: 1.902 ms.
Best time for 62 bit trial factors: 1.977 ms.
Best time for 63 bit trial factors: 2.330 ms.
Best time for 64 bit trial factors: 2.866 ms.
Best time for 65 bit trial factors: 3.024 ms.
Best time for 66 bit trial factors: 3.162 ms.
Best time for 67 bit trial factors: 3.137 ms.

I'll be running it close to stock for any submitted results, of course.

Ethan (EO) · 2010-04-09, 08:35

This last result wouldn't fit under the 10000 character (or is it word?) limit on the last post, and I don't think it really counts anyway. I only made it through the single-threaded test :)

Code:

Intel(R) Core(TM) i3 CPU         540  @ 3.07GHz
CPU speed: 4806.96 MHz, 2 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 7.973 ms.
Best time for 896K FFT length: 9.636 ms.
Best time for 1024K FFT length: 10.882 ms.
Best time for 1280K FFT length: 13.642 ms.
Best time for 1536K FFT length: 16.522 ms.
Best time for 1792K FFT length: 19.998 ms.
Best time for 2048K FFT length: 22.618 ms.
Best time for 2560K FFT length: 30.160 ms.
Best time for 3072K FFT length: 36.656 ms.
Best time for 3584K FFT length: 44.493 ms.
Best time for 4096K FFT length: 50.223 ms.
Best time for 5120K FFT length: 64.158 ms.
Best time for 6144K FFT length: 76.345 ms.
Best time for 7168K FFT length: 93.079 ms.
Best time for 8192K FFT length: 104.826 ms.

< 8ms for 768k FFT length! If memory serves me, this is about 8000 times faster than my first GIMPS machine :D :D

henryzz · 2010-04-09, 15:57

Quote:

Originally Posted by Ethan (EO)

I'll be running it close to stock for any submitted results, of course.

As long as it is properly stable then the more overclocked the better.

satchvai · 2010-04-12, 02:24

Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
CPU speed: 4010.23 MHz, 8 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 8.748 ms.
Best time for 896K FFT length: 10.609 ms.
Best time for 1024K FFT length: 11.955 ms.
Best time for 1280K FFT length: 15.069 ms.
Best time for 1536K FFT length: 18.196 ms.
Best time for 1792K FFT length: 21.953 ms.
Best time for 2048K FFT length: 24.804 ms.
Best time for 2560K FFT length: 33.066 ms.
Best time for 3072K FFT length: 40.369 ms.
Best time for 3584K FFT length: 48.992 ms.
Best time for 4096K FFT length: 55.264 ms.
Best time for 5120K FFT length: 70.915 ms.
Best time for 6144K FFT length: 84.439 ms.
Best time for 7168K FFT length: 102.407 ms.
Best time for 8192K FFT length: 115.802 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 9.000 ms.
Best time for 896K FFT length: 10.978 ms.
Best time for 1024K FFT length: 12.365 ms.
Best time for 1280K FFT length: 15.738 ms.
Best time for 1536K FFT length: 18.689 ms.
Best time for 1792K FFT length: 22.990 ms.
Best time for 2048K FFT length: 25.284 ms.
Best time for 2560K FFT length: 33.789 ms.
Best time for 3072K FFT length: 40.301 ms.
Best time for 3584K FFT length: 49.153 ms.
Best time for 4096K FFT length: 54.548 ms.
Best time for 5120K FFT length: 70.452 ms.
Best time for 6144K FFT length: 84.298 ms.
[Sun Apr 11 22:16:12 2010]
Best time for 7168K FFT length: 101.948 ms.
Best time for 8192K FFT length: 112.960 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 5.325 ms.
Best time for 896K FFT length: 6.410 ms.
Best time for 1024K FFT length: 7.859 ms.
Best time for 1280K FFT length: 9.127 ms.
Best time for 1536K FFT length: 10.830 ms.
Best time for 1792K FFT length: 13.346 ms.
Best time for 2048K FFT length: 14.706 ms.
Best time for 2560K FFT length: 19.739 ms.
Best time for 3072K FFT length: 23.589 ms.
Best time for 3584K FFT length: 29.010 ms.
Best time for 4096K FFT length: 32.161 ms.
Best time for 5120K FFT length: 41.749 ms.
Best time for 6144K FFT length: 49.773 ms.
Best time for 7168K FFT length: 60.770 ms.
Best time for 8192K FFT length: 67.212 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 5.239 ms.
Best time for 896K FFT length: 6.012 ms.
Best time for 1024K FFT length: 7.485 ms.
Best time for 1280K FFT length: 8.164 ms.
Best time for 1536K FFT length: 9.737 ms.
Best time for 1792K FFT length: 11.774 ms.
Best time for 2048K FFT length: 13.204 ms.
Best time for 2560K FFT length: 17.438 ms.
Best time for 3072K FFT length: 20.702 ms.
Best time for 3584K FFT length: 25.156 ms.
Best time for 4096K FFT length: 28.004 ms.
Best time for 5120K FFT length: 36.315 ms.
Best time for 6144K FFT length: 43.531 ms.
Best time for 7168K FFT length: 52.476 ms.
Best time for 8192K FFT length: 58.572 ms.
Timing FFTs using 5 threads.
Best time for 768K FFT length: 4.227 ms.
Best time for 896K FFT length: 4.897 ms.
Best time for 1024K FFT length: 6.268 ms.
Best time for 1280K FFT length: 6.327 ms.
Best time for 1536K FFT length: 7.528 ms.
Best time for 1792K FFT length: 8.753 ms.
Best time for 2048K FFT length: 9.929 ms.
Best time for 2560K FFT length: 12.952 ms.
Best time for 3072K FFT length: 15.537 ms.
Best time for 3584K FFT length: 18.795 ms.
Best time for 4096K FFT length: 21.202 ms.
Best time for 5120K FFT length: 27.590 ms.
Best time for 6144K FFT length: 33.947 ms.
Best time for 7168K FFT length: 41.614 ms.
Best time for 8192K FFT length: 46.205 ms.
Timing FFTs using 6 threads.
Best time for 768K FFT length: 4.374 ms.
Best time for 896K FFT length: 5.041 ms.
Best time for 1024K FFT length: 6.417 ms.
Best time for 1280K FFT length: 6.577 ms.
Best time for 1536K FFT length: 7.834 ms.
Best time for 1792K FFT length: 9.142 ms.
Best time for 2048K FFT length: 10.316 ms.
Best time for 2560K FFT length: 12.859 ms.
Best time for 3072K FFT length: 15.444 ms.
Best time for 3584K FFT length: 17.986 ms.
Best time for 4096K FFT length: 20.469 ms.
Best time for 5120K FFT length: 25.563 ms.
Best time for 6144K FFT length: 33.007 ms.
Best time for 7168K FFT length: 39.752 ms.
Best time for 8192K FFT length: 45.174 ms.
Timing FFTs using 7 threads.
Best time for 768K FFT length: 3.862 ms.
Best time for 896K FFT length: 4.428 ms.
Best time for 1024K FFT length: 5.757 ms.
Best time for 1280K FFT length: 5.785 ms.
Best time for 1536K FFT length: 6.906 ms.
Best time for 1792K FFT length: 7.948 ms.
Best time for 2048K FFT length: 9.040 ms.
Best time for 2560K FFT length: 11.260 ms.
Best time for 3072K FFT length: 13.422 ms.
Best time for 3584K FFT length: 15.612 ms.
Best time for 4096K FFT length: 17.833 ms.
Best time for 5120K FFT length: 22.291 ms.
Best time for 6144K FFT length: 29.035 ms.
Best time for 7168K FFT length: 35.325 ms.
Best time for 8192K FFT length: 40.729 ms.
Timing FFTs using 8 threads.
Best time for 768K FFT length: 4.046 ms.
Best time for 896K FFT length: 4.623 ms.
Best time for 1024K FFT length: 5.981 ms.
Best time for 1280K FFT length: 6.094 ms.
Best time for 1536K FFT length: 7.288 ms.
Best time for 1792K FFT length: 8.436 ms.
Best time for 2048K FFT length: 9.578 ms.
Best time for 2560K FFT length: 11.928 ms.
Best time for 3072K FFT length: 14.181 ms.
Best time for 3584K FFT length: 16.611 ms.
Best time for 4096K FFT length: 18.990 ms.
Best time for 5120K FFT length: 23.572 ms.
Best time for 6144K FFT length: 30.192 ms.
Best time for 7168K FFT length: 36.903 ms.
Best time for 8192K FFT length: 42.362 ms.
Best time for 58 bit trial factors: 1.839 ms.
Best time for 59 bit trial factors: 1.859 ms.
Best time for 60 bit trial factors: 1.858 ms.
Best time for 61 bit trial factors: 2.053 ms.
Best time for 62 bit trial factors: 2.170 ms.
Best time for 63 bit trial factors: 2.563 ms.
Best time for 64 bit trial factors: 3.076 ms.
Best time for 65 bit trial factors: 3.342 ms.
Best time for 66 bit trial factors: 3.496 ms.
Best time for 67 bit trial factors: 3.469 ms.

lavalamp · 2010-04-12, 17:49

That's mighty impressive to be stable at 4.2 GHz on air. What's your setup?

S485122 · 2010-04-12, 20:58

Quote:

Originally Posted by satchvai

Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
CPU speed: 4010.23 MHz, 8 cores

Could you give it a try without hyperthreading ? From your data it seems there is a big overhead running with helper threads (multiple threads for one workunit.)

Jacob

satchvai · 2010-04-15, 15:24

Quote:

Originally Posted by lavalamp

That's mighty impressive to be stable at 4.2 GHz on air. What's your setup?

HAF 922 case
Prolimatech Megahelms cooler with Ultra Kaze fan attached.
Antec Spot cooler over Voltage regulators.
Artic Silver
EVGA X58 SLI 132-BL-E758-A1
i7 920 Vcore 1.31
She gets a little hot on Linx, temps run around 80 under full load but passes the stability test. idle temps are in the 42 range.

satchvai · 2010-04-15, 15:26

Quote:

Originally Posted by S485122

Could you give it a try without hyperthreading ? From your data it seems there is a big overhead running with helper threads (multiple threads for one workunit.)

Jacob

Sure

satchvai · 2010-04-15, 15:39

Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
CPU speed: 4010.07 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.11, RdtscTiming=1
Best time for 768K FFT length: 8.739 ms.
Best time for 896K FFT length: 10.663 ms.
Best time for 1024K FFT length: 11.947 ms.
Best time for 1280K FFT length: 15.056 ms.
Best time for 1536K FFT length: 18.175 ms.
Best time for 1792K FFT length: 21.964 ms.
Best time for 2048K FFT length: 24.790 ms.
Best time for 2560K FFT length: 33.015 ms.
Best time for 3072K FFT length: 40.258 ms.
Best time for 3584K FFT length: 48.918 ms.
Best time for 4096K FFT length: 55.184 ms.
Best time for 5120K FFT length: 70.805 ms.
Best time for 6144K FFT length: 84.363 ms.
Best time for 7168K FFT length: 102.260 ms.
Best time for 8192K FFT length: 115.184 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 4.588 ms.
Best time for 896K FFT length: 5.542 ms.
Best time for 1024K FFT length: 6.371 ms.
Best time for 1280K FFT length: 7.922 ms.
Best time for 1536K FFT length: 9.590 ms.
Best time for 1792K FFT length: 11.566 ms.
Best time for 2048K FFT length: 13.052 ms.
Best time for 2560K FFT length: 17.144 ms.
Best time for 3072K FFT length: 20.770 ms.
Best time for 3584K FFT length: 25.189 ms.
Best time for 4096K FFT length: 28.386 ms.
Best time for 5120K FFT length: 36.479 ms.
Best time for 6144K FFT length: 43.749 ms.
Best time for 7168K FFT length: 53.097 ms.
Best time for 8192K FFT length: 59.952 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 3.544 ms.
Best time for 896K FFT length: 4.037 ms.
Best time for 1024K FFT length: 5.365 ms.
Best time for 1280K FFT length: 5.348 ms.
Best time for 1536K FFT length: 6.434 ms.
Best time for 1792K FFT length: 7.814 ms.
Best time for 2048K FFT length: 8.771 ms.
Best time for 2560K FFT length: 11.590 ms.
Best time for 3072K FFT length: 14.075 ms.
Best time for 3584K FFT length: 17.104 ms.
Best time for 4096K FFT length: 19.345 ms.
Best time for 5120K FFT length: 25.538 ms.
Best time for 6144K FFT length: 32.499 ms.
Best time for 7168K FFT length: 39.316 ms.
Best time for 8192K FFT length: 44.946 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 3.149 ms.
Best time for 896K FFT length: 3.593 ms.
Best time for 1024K FFT length: 4.774 ms.
Best time for 1280K FFT length: 4.500 ms.
Best time for 1536K FFT length: 5.356 ms.
Best time for 1792K FFT length: 6.191 ms.
Best time for 2048K FFT length: 7.063 ms.
Best time for 2560K FFT length: 8.911 ms.
Best time for 3072K FFT length: 10.778 ms.
Best time for 3584K FFT length: 13.120 ms.
Best time for 4096K FFT length: 15.068 ms.
Best time for 5120K FFT length: 19.265 ms.
Best time for 6144K FFT length: 24.122 ms.
Best time for 7168K FFT length: 30.698 ms.
Best time for 8192K FFT length: 36.146 ms.
Best time for 58 bit trial factors: 1.839 ms.
Best time for 59 bit trial factors: 1.859 ms.
Best time for 60 bit trial factors: 1.857 ms.
Best time for 61 bit trial factors: 2.052 ms.
Best time for 62 bit trial factors: 2.169 ms.
Best time for 63 bit trial factors: 2.563 ms.
Best time for 64 bit trial factors: 3.157 ms.
Best time for 65 bit trial factors: 3.337 ms.
Best time for 66 bit trial factors: 3.496 ms.
Best time for 67 bit trial factors: 3.468 ms.

Colt45ws · 2010-12-05, 09:55

I have noticed the same thing on my i7. Im running 4010MHz as well, though I had to bump it to 1.34VCore. I left HTT enabled in BIOS but disabled it in the Prime95 config. Speedup is about 5ms per iteration depending on FFT size and it burns about 15W less electrical power according to Gigabyte DES.
I checked the same thing on my Prescott P4 and Atom, the effect was the opposite. Slower, and much slower on the Atom.
The way I interpret this, is P95 is utilizing the capability of an i7 core well enough, that there is not much in the way of resources left for the 'fake' thread to utilize, or the way its splitting the load does not work well with it.

abstractalgebra · 2011-01-20, 07:03

I5-2500k Sandy Bridge Benchmark
Turbo Overclocked to 4.1GHz, 1333 DDR3, Unbuntu 10.10, mprime 2511-64bit.

Stock cooler, will post more benchmarks speed increases. 4.4-4.6 appears to be common with ~5Ghz if rather lucky

Hit enter to continue: [Main thread Jan 20 01:52] Starting worker.
[Worker #1 Jan 20 01:52] Worker starting
[Worker #1 Jan 20 01:52] Setting affinity to run worker on logical CPU #0
[Worker #1 Jan 20 01:52] Your timings will be written to the results.txt file.
[Worker #1 Jan 20 01:52] Compare your results to other computers at http://www.mersenne.org/report_benchmarks
[Worker #1 Jan 20 01:52] Timing 55 iterations at 768K FFT length. Best time: 6.818 ms.
[Worker #1 Jan 20 01:52] Timing 47 iterations at 896K FFT length. Best time: 8.416 ms.
[Worker #1 Jan 20 01:52] Timing 41 iterations at 1024K FFT length. Best time: 9.397 ms.
[Worker #1 Jan 20 01:53] Timing 33 iterations at 1280K FFT length. Best time: 11.923 ms.
[Worker #1 Jan 20 01:53] Timing 27 iterations at 1536K FFT length. Best time: 14.280 ms.
[Worker #1 Jan 20 01:53] Timing 23 iterations at 1792K FFT length. Best time: 17.603 ms.
[Worker #1 Jan 20 01:53] Timing 20 iterations at 2048K FFT length. Best time: 19.479 ms.
[Worker #1 Jan 20 01:53] Timing 16 iterations at 2560K FFT length. Best time: 26.130 ms.
[Worker #1 Jan 20 01:53] Timing 13 iterations at 3072K FFT length. Best time: 31.586 ms.
[Worker #1 Jan 20 01:53] Timing 11 iterations at 3584K FFT length. Best time: 38.991 ms.
[Worker #1 Jan 20 01:53] Timing 10 iterations at 4096K FFT length. Best time: 43.271 ms.
[Worker #1 Jan 20 01:53] Timing 10 iterations at 5120K FFT length. Best time: 55.765 ms.
[Worker #1 Jan 20 01:53] Timing 10 iterations at 6144K FFT length. Best time: 66.860 ms.
[Worker #1 Jan 20 01:53] Timing 10 iterations at 7168K FFT length. Best time: 81.550 ms.
[Worker #1 Jan 20 01:53] Timing 10 iterations at 8192K FFT length. Best time: 91.063 ms.

willmore · 2011-01-21, 15:42

Quote:

Originally Posted by Colt45ws

The way I interpret this, is P95 is utilizing the capability of an i7 core well enough, that there is not much in the way of resources left for the 'fake' thread to utilize, or the way its splitting the load does not work well with it.

I'm curious of this holds true for SB. I'm looking to build out an SB system in the near future and I'm not sure the extra $100 for a 2600K vs a 2500K is worth it just for HT. I'm going to move this into my existing water cooled box, so I imagine they'll both overclock just as well, so all that leaves is HT or no HT.

Anyone got an opinion on this?

Prime95 · 2011-01-21, 17:15

Quote:

Originally Posted by willmore

Anyone got an opinion on this?

For prime95 I would not get HT. If you do other projects like NFS sieving or GMP-ECM, the HT might be worthwhile.

mdettweiler · 2011-01-21, 22:20

Quote:

Originally Posted by Prime95

For prime95 I would not get HT. If you do other projects like NFS sieving or GMP-ECM, the HT might be worthwhile.

Just curious...does this conclusion also apply for smaller FFT work as done by LLR? A friend of mine on the forum has an i7 and says that he gets ~5 cores' worth of speed on LLR because of the HT, but some of that could just be because his non-HT reference for comparison is a somewhat older Q6600.

abstractalgebra · 2011-01-22, 15:43

i5-2500K overclocked by turbo to 4.59Ghz w/1600Mhz XMP RAM (defaults)

[Sat Jan 22 10:38:54 2011]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz
CPU speed: 3292.69 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: unknown
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: unknown
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.4, RdtscTiming=1
Best time for 768K FFT length: 5.598 ms., avg: 5.699 ms.
Best time for 896K FFT length: 6.896 ms., avg: 6.935 ms.
Best time for 1024K FFT length: 7.514 ms., avg: 7.639 ms.
Best time for 1280K FFT length: 9.756 ms., avg: 9.911 ms.
Best time for 1536K FFT length: 11.813 ms., avg: 11.993 ms.
Best time for 1792K FFT length: 14.354 ms., avg: 14.370 ms.
Best time for 2048K FFT length: 15.807 ms., avg: 15.844 ms.
Best time for 2560K FFT length: 20.169 ms., avg: 20.199 ms.
Best time for 3072K FFT length: 24.739 ms., avg: 24.791 ms.
Best time for 3584K FFT length: 29.892 ms., avg: 29.951 ms.
Best time for 4096K FFT length: 33.029 ms., avg: 33.077 ms.
Best time for 5120K FFT length: 42.875 ms., avg: 42.908 ms.
Best time for 6144K FFT length: 53.270 ms., avg: 53.807 ms.
Best time for 7168K FFT length: 65.453 ms., avg: 65.904 ms.
Best time for 8192K FFT length: 71.324 ms., avg: 72.243 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 3.022 ms., avg: 3.048 ms.
Best time for 896K FFT length: 3.677 ms., avg: 3.856 ms.
Best time for 1024K FFT length: 4.035 ms., avg: 4.128 ms.
Best time for 1280K FFT length: 5.150 ms., avg: 5.292 ms.
Best time for 1536K FFT length: 6.131 ms., avg: 6.144 ms.
Best time for 1792K FFT length: 7.581 ms., avg: 7.793 ms.
Best time for 2048K FFT length: 8.344 ms., avg: 8.379 ms.
Best time for 2560K FFT length: 10.628 ms., avg: 10.903 ms.
Best time for 3072K FFT length: 12.972 ms., avg: 13.322 ms.
Best time for 3584K FFT length: 15.672 ms., avg: 15.881 ms.
Best time for 4096K FFT length: 17.281 ms., avg: 17.750 ms.
Best time for 5120K FFT length: 22.446 ms., avg: 22.583 ms.
Best time for 6144K FFT length: 27.890 ms., avg: 28.191 ms.
Best time for 7168K FFT length: 34.689 ms., avg: 35.205 ms.
Best time for 8192K FFT length: 37.308 ms., avg: 37.414 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 2.078 ms., avg: 2.122 ms.
Best time for 896K FFT length: 2.563 ms., avg: 2.664 ms.
Best time for 1024K FFT length: 2.816 ms., avg: 2.968 ms.
Best time for 1280K FFT length: 3.561 ms., avg: 3.649 ms.
Best time for 1536K FFT length: 4.219 ms., avg: 4.327 ms.
Best time for 1792K FFT length: 5.210 ms., avg: 5.251 ms.
Best time for 2048K FFT length: 5.765 ms., avg: 5.801 ms.
Best time for 2560K FFT length: 7.328 ms., avg: 7.624 ms.
Best time for 3072K FFT length: 8.937 ms., avg: 9.280 ms.
Best time for 3584K FFT length: 10.750 ms., avg: 10.768 ms.
Best time for 4096K FFT length: 11.897 ms., avg: 12.342 ms.
Best time for 5120K FFT length: 15.377 ms., avg: 15.549 ms.
Best time for 6144K FFT length: 18.939 ms., avg: 19.378 ms.
Best time for 7168K FFT length: 25.291 ms., avg: 26.186 ms.
Best time for 8192K FFT length: 25.706 ms., avg: 25.900 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 1.738 ms., avg: 1.868 ms.
Best time for 896K FFT length: 1.986 ms., avg: 2.019 ms.
Best time for 1024K FFT length: 2.238 ms., avg: 2.482 ms.
Best time for 1280K FFT length: 2.781 ms., avg: 2.986 ms.
Best time for 1536K FFT length: 3.345 ms., avg: 3.837 ms.
Best time for 1792K FFT length: 4.082 ms., avg: 4.319 ms.
Best time for 2048K FFT length: 4.515 ms., avg: 4.792 ms.
Best time for 2560K FFT length: 5.774 ms., avg: 6.054 ms.
Best time for 3072K FFT length: 6.942 ms., avg: 7.309 ms.
Best time for 3584K FFT length: 8.422 ms., avg: 8.582 ms.
Best time for 4096K FFT length: 9.295 ms., avg: 9.801 ms.
Best time for 5120K FFT length: 11.995 ms., avg: 12.454 ms.
Best time for 6144K FFT length: 14.655 ms., avg: 14.902 ms.
Best time for 7168K FFT length: 23.160 ms., avg: 23.649 ms.
Best time for 8192K FFT length: 19.803 ms., avg: 20.997 ms.
Best time for 58 bit trial factors: 1.453 ms.
Best time for 59 bit trial factors: 1.504 ms.
Best time for 60 bit trial factors: 1.502 ms.
Best time for 61 bit trial factors: 1.687 ms.
Best time for 62 bit trial factors: 1.675 ms.
Best time for 63 bit trial factors: 1.896 ms.
Best time for 64 bit trial factors: 1.983 ms.
Best time for 65 bit trial factors: 2.307 ms.
Best time for 66 bit trial factors: 2.729 ms.
Best time for 67 bit trial factors: 2.695 ms.

http://valid.canardpc.com/show_oc.php?id=1611553

James Heinrich · 2011-01-22, 18:49

Quote:

Originally Posted by abstractalgebra

i5-2500K overclocked by turbo to 4.59Ghz w/1600Mhz XMP RAM (defaults)
...
Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz
CPU speed: 3292.69 MHz, 4 cores

So which is it? 3.3GHz or 4.6GHz?

abstractalgebra · 2011-01-22, 21:48

Quote:

Originally Posted by James Heinrich

So which is it? 3.3GHz or 4.6GHz?

Fair question, the CPU defaults to 3.3GHz but my overlocked turbo boosts to 4.6 GHz. With Sandy Bridge you can't just increase the default GHz, so it would be nice for Prime95 to implement a CPU-Z style check of the current speed. (see the validated CPU speed link in my other post)

To make matters more complex, you can set different turbo boost multipliers for 1,2,3,4 cores being active. In my benchmark I set all cores at the same 46x = 4.6GHz. However, for example, if only one core was active I could setup a 48x multiplier to get one core at 4.8Ghz.

Commaster · 2011-01-23, 01:14

By the way, which is more stable: a higher Base Clock or an insanely huge Multiplier? (Speaking only about the CPU itself)

James Heinrich · 2011-01-23, 01:32

Quote:

Originally Posted by Commaster

By the way, which is more stable: a higher Base Clock or an insanely huge Multiplier? (Speaking only about the CPU itself)

Isn't that kind of a non-issue now with SandyBridge? You're basically now limited (as I understand it) to playing with the multiplier; adjusting the base clock by anything other than a tiny amount is no longer feasible since it affects everything, including things like PCIe that don't like to be overclocked.

lavalamp · 2011-01-23, 03:50

Quote:

Originally Posted by abstractalgebra

Fair question, the CPU defaults to 3.3GHz but my overlocked turbo boosts to 4.6 GHz. With Sandy Bridge you can't just increase the default GHz, so it would be nice for Prime95 to implement a CPU-Z style check of the current speed.

I don't know if it is the same for all boards, but on Gigabyte boards at least, you can set the max turbo mode CPU multiplier for 1 - 4 cores, or you can disable turbo mode entirely and set a constant multiplier for all cores.

James Heinrich · 2011-01-25, 03:07

It's now possible to directly compare between CPUs on my throughput calculator. For example, assuming identical clockspeeds, you can see how an i7-2500K neatly outruns an i7-965 by a noticable amount.

Brain · 2011-01-27, 22:55

Hyper threading was enabled as it cannot be turned off in BIOS: 4 physical cores, 8 logical.

Code:

[Thu Jan 27 21:29:26 2011]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
CPU speed: 1995.49 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: unknown
L2 cache size: 256 KB, L3 cache size: 6 MB
L1 cache line size: unknown
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.4, RdtscTiming=1
Best time for 768K FFT length: 8.876 ms., avg: 9.077 ms.
Best time for 896K FFT length: 10.881 ms., avg: 11.136 ms.
Best time for 1024K FFT length: 11.874 ms., avg: 12.118 ms.
Best time for 1280K FFT length: 15.445 ms., avg: 15.701 ms.
Best time for 1536K FFT length: 18.722 ms., avg: 19.108 ms.
Best time for 1792K FFT length: 22.731 ms., avg: 23.195 ms.
Best time for 2048K FFT length: 25.190 ms., avg: 25.595 ms.
Best time for 2560K FFT length: 32.092 ms., avg: 32.462 ms.
Best time for 3072K FFT length: 39.602 ms., avg: 39.933 ms.
Best time for 3584K FFT length: 47.419 ms., avg: 48.026 ms.
Best time for 4096K FFT length: 52.857 ms., avg: 53.264 ms.
Best time for 5120K FFT length: 68.475 ms., avg: 69.319 ms.
Best time for 6144K FFT length: 85.146 ms., avg: 85.692 ms.
Best time for 7168K FFT length: 104.642 ms., avg: 105.383 ms.
Best time for 8192K FFT length: 114.059 ms., avg: 114.784 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 8.751 ms., avg: 8.897 ms.
Best time for 896K FFT length: 10.566 ms., avg: 10.749 ms.
Best time for 1024K FFT length: 11.743 ms., avg: 11.901 ms.
Best time for 1280K FFT length: 15.098 ms., avg: 15.285 ms.
Best time for 1536K FFT length: 18.575 ms., avg: 18.947 ms.
Best time for 1792K FFT length: 22.351 ms., avg: 22.925 ms.
Best time for 2048K FFT length: 24.951 ms., avg: 25.738 ms.
Best time for 2560K FFT length: 31.595 ms., avg: 32.080 ms.
Best time for 3072K FFT length: 39.525 ms., avg: 39.934 ms.
Best time for 3584K FFT length: 46.979 ms., avg: 47.450 ms.
Best time for 4096K FFT length: 52.403 ms., avg: 53.234 ms.
Best time for 5120K FFT length: 68.149 ms., avg: 68.727 ms.
Best time for 6144K FFT length: 84.348 ms., avg: 85.057 ms.
Best time for 7168K FFT length: 99.693 ms., avg: 100.411 ms.
Best time for 8192K FFT length: 111.530 ms., avg: 112.547 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 4.648 ms., avg: 4.872 ms.
Best time for 896K FFT length: 5.702 ms., avg: 6.040 ms.
Best time for 1024K FFT length: 6.249 ms., avg: 6.553 ms.
Best time for 1280K FFT length: 8.015 ms., avg: 8.333 ms.
Best time for 1536K FFT length: 9.844 ms., avg: 10.271 ms.
Best time for 1792K FFT length: 11.883 ms., avg: 12.305 ms.
Best time for 2048K FFT length: 13.316 ms., avg: 13.835 ms.
Best time for 2560K FFT length: 17.966 ms., avg: 18.100 ms.
Best time for 3072K FFT length: 20.749 ms., avg: 21.272 ms.
Best time for 3584K FFT length: 24.707 ms., avg: 25.330 ms.
Best time for 4096K FFT length: 27.675 ms., avg: 28.176 ms.
Best time for 5120K FFT length: 35.779 ms., avg: 36.624 ms.
Best time for 6144K FFT length: 44.200 ms., avg: 44.772 ms.
Best time for 7168K FFT length: 55.019 ms., avg: 55.718 ms.
Best time for 8192K FFT length: 58.438 ms., avg: 58.888 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 3.808 ms., avg: 3.842 ms.
Best time for 896K FFT length: 4.255 ms., avg: 4.307 ms.
Best time for 1024K FFT length: 5.118 ms., avg: 5.222 ms.
Best time for 1280K FFT length: 6.128 ms., avg: 6.221 ms.
Best time for 1536K FFT length: 7.416 ms., avg: 7.538 ms.
Best time for 1792K FFT length: 8.855 ms., avg: 8.904 ms.
Best time for 2048K FFT length: 9.911 ms., avg: 10.040 ms.
Best time for 2560K FFT length: 12.479 ms., avg: 12.539 ms.
Best time for 3072K FFT length: 15.262 ms., avg: 15.349 ms.
Best time for 3584K FFT length: 18.085 ms., avg: 18.121 ms.
Best time for 4096K FFT length: 20.277 ms., avg: 20.347 ms.
Best time for 5120K FFT length: 26.159 ms., avg: 26.340 ms.
Best time for 6144K FFT length: 32.225 ms., avg: 32.317 ms.
Best time for 7168K FFT length: 48.041 ms., avg: 48.179 ms.
Best time for 8192K FFT length: 42.609 ms., avg: 42.717 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 3.371 ms., avg: 3.466 ms.
Best time for 896K FFT length: 3.422 ms., avg: 3.545 ms.
Best time for 1024K FFT length: 4.536 ms., avg: 4.572 ms.
Best time for 1280K FFT length: 5.327 ms., avg: 5.813 ms.
Best time for 1536K FFT length: 6.235 ms., avg: 6.763 ms.
Best time for 1792K FFT length: 6.938 ms., avg: 7.233 ms.
Best time for 2048K FFT length: 7.858 ms., avg: 10.102 ms.
Best time for 2560K FFT length: 10.128 ms., avg: 10.909 ms.
Best time for 3072K FFT length: 12.041 ms., avg: 12.245 ms.
Best time for 3584K FFT length: 14.106 ms., avg: 14.450 ms.
Best time for 4096K FFT length: 15.968 ms., avg: 16.196 ms.
Best time for 5120K FFT length: 20.454 ms., avg: 20.689 ms.
Best time for 6144K FFT length: 25.277 ms., avg: 25.395 ms.
Best time for 7168K FFT length: 48.600 ms., avg: 49.073 ms.
Best time for 8192K FFT length: 33.533 ms., avg: 34.063 ms.
Best time for 58 bit trial factors: 2.307 ms.
Best time for 59 bit trial factors: 2.379 ms.
Best time for 60 bit trial factors: 2.378 ms.
Best time for 61 bit trial factors: 2.676 ms.
Best time for 62 bit trial factors: 2.663 ms.
Best time for 63 bit trial factors: 3.014 ms.
Best time for 64 bit trial factors: 3.136 ms.
Best time for 65 bit trial factors: 3.668 ms.
Best time for 66 bit trial factors: 4.332 ms.
Best time for 67 bit trial factors: 4.294 ms.

db597 · 2011-02-09, 15:57

HT enabled, running with dual channel DDR3-1600MHz memory.

Code:

Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
CPU speed: 4447.00 MHz, 4 hyperthreaded cores
CPU features: Prefetch, MMX, SSE, SSE2, SSE4, AVX
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.5, RdtscTiming=1
Best time for 768K FFT length: 5.693 ms., avg: 5.789 ms.
Best time for 896K FFT length: 6.960 ms., avg: 7.100 ms.
Best time for 1024K FFT length: 7.643 ms., avg: 7.799 ms.
Best time for 1280K FFT length: 9.932 ms., avg: 10.104 ms.
Best time for 1536K FFT length: 12.037 ms., avg: 12.260 ms.
Best time for 1792K FFT length: 14.628 ms., avg: 14.835 ms.
Best time for 2048K FFT length: 16.127 ms., avg: 16.360 ms.
Best time for 2560K FFT length: 20.544 ms., avg: 20.842 ms.
Best time for 3072K FFT length: 25.232 ms., avg: 25.596 ms.
Best time for 3584K FFT length: 30.542 ms., avg: 30.812 ms.
Best time for 4096K FFT length: 33.657 ms., avg: 34.076 ms.
Best time for 5120K FFT length: 43.843 ms., avg: 44.247 ms.
Best time for 6144K FFT length: 54.344 ms., avg: 54.734 ms.
Best time for 7168K FFT length: 66.872 ms., avg: 67.481 ms.
Best time for 8192K FFT length: 73.193 ms., avg: 73.679 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 5.602 ms., avg: 5.662 ms.
Best time for 896K FFT length: 6.762 ms., avg: 6.832 ms.
Best time for 1024K FFT length: 7.520 ms., avg: 7.613 ms.
Best time for 1280K FFT length: 9.684 ms., avg: 9.770 ms.
Best time for 1536K FFT length: 11.915 ms., avg: 11.986 ms.
Best time for 1792K FFT length: 14.345 ms., avg: 14.508 ms.
Best time for 2048K FFT length: 16.033 ms., avg: 16.140 ms.
Best time for 2560K FFT length: 20.297 ms., avg: 20.450 ms.
Best time for 3072K FFT length: 25.116 ms., avg: 25.308 ms.
Best time for 3584K FFT length: 30.095 ms., avg: 30.212 ms.
Best time for 4096K FFT length: 33.572 ms., avg: 33.758 ms.
Best time for 5120K FFT length: 43.543 ms., avg: 43.724 ms.
Best time for 6144K FFT length: 53.783 ms., avg: 54.022 ms.
Best time for 7168K FFT length: 63.308 ms., avg: 63.639 ms.
Best time for 8192K FFT length: 71.044 ms., avg: 71.333 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 2.866 ms., avg: 2.956 ms.
Best time for 896K FFT length: 3.494 ms., avg: 3.544 ms.
Best time for 1024K FFT length: 3.888 ms., avg: 3.986 ms.
Best time for 1280K FFT length: 4.965 ms., avg: 5.050 ms.
Best time for 1536K FFT length: 6.103 ms., avg: 6.198 ms.
Best time for 1792K FFT length: 7.377 ms., avg: 7.456 ms.
Best time for 2048K FFT length: 8.268 ms., avg: 8.349 ms.
Best time for 2560K FFT length: 10.390 ms., avg: 10.493 ms.
Best time for 3072K FFT length: 12.902 ms., avg: 13.016 ms.
Best time for 3584K FFT length: 15.377 ms., avg: 15.451 ms.
Best time for 4096K FFT length: 17.228 ms., avg: 17.332 ms.
Best time for 5120K FFT length: 22.210 ms., avg: 22.329 ms.
Best time for 6144K FFT length: 27.351 ms., avg: 27.594 ms.
Best time for 7168K FFT length: 33.106 ms., avg: 33.382 ms.
Best time for 8192K FFT length: 36.219 ms., avg: 36.526 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 2.199 ms., avg: 2.245 ms.
Best time for 896K FFT length: 2.427 ms., avg: 2.527 ms.
Best time for 1024K FFT length: 2.982 ms., avg: 3.113 ms.
Best time for 1280K FFT length: 3.546 ms., avg: 3.789 ms.
Best time for 1536K FFT length: 4.315 ms., avg: 4.432 ms.
Best time for 1792K FFT length: 5.179 ms., avg: 5.268 ms.
Best time for 2048K FFT length: 5.777 ms., avg: 5.885 ms.
Best time for 2560K FFT length: 7.296 ms., avg: 7.420 ms.
Best time for 3072K FFT length: 8.875 ms., avg: 9.170 ms.
Best time for 3584K FFT length: 10.578 ms., avg: 10.777 ms.
Best time for 4096K FFT length: 11.816 ms., avg: 11.915 ms.
Best time for 5120K FFT length: 15.225 ms., avg: 15.381 ms.
Best time for 6144K FFT length: 18.782 ms., avg: 18.861 ms.
Best time for 7168K FFT length: 25.626 ms., avg: 26.212 ms.
Best time for 8192K FFT length: 24.715 ms., avg: 24.923 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 1.930 ms., avg: 1.976 ms.
Best time for 896K FFT length: 1.922 ms., avg: 2.163 ms.
Best time for 1024K FFT length: 2.654 ms., avg: 2.723 ms.
Best time for 1280K FFT length: 3.109 ms., avg: 3.168 ms.
Best time for 1536K FFT length: 3.697 ms., avg: 3.797 ms.
Best time for 1792K FFT length: 4.112 ms., avg: 4.797 ms.
Best time for 2048K FFT length: 4.710 ms., avg: 5.454 ms.
Best time for 2560K FFT length: 6.070 ms., avg: 6.483 ms.
Best time for 3072K FFT length: 7.215 ms., avg: 8.108 ms.
Best time for 3584K FFT length: 8.428 ms., avg: 9.411 ms.
Best time for 4096K FFT length: 9.599 ms., avg: 10.867 ms.
Best time for 5120K FFT length: 12.247 ms., avg: 13.452 ms.
Best time for 6144K FFT length: 15.047 ms., avg: 16.299 ms.
Best time for 7168K FFT length: 26.160 ms., avg: 26.863 ms.
Best time for 8192K FFT length: 19.882 ms., avg: 21.333 ms.
Best time for 58 bit trial factors: 1.482 ms.
Best time for 59 bit trial factors: 1.539 ms.
Best time for 60 bit trial factors: 1.532 ms.
Best time for 61 bit trial factors: 1.719 ms.
Best time for 62 bit trial factors: 1.713 ms.
Best time for 63 bit trial factors: 1.938 ms.
Best time for 64 bit trial factors: 2.022 ms.
Best time for 65 bit trial factors: 2.357 ms.
Best time for 66 bit trial factors: 2.783 ms.
Best time for 67 bit trial factors: 2.756 ms.

nucleon · 2011-02-13, 05:03

2600k, 2133MHz RAM, running at 45x, ud7 mboard

Code:

Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
CPU speed: 4437.07 MHz, 4 hyperthreaded cores
CPU features: Prefetch, MMX, SSE, SSE2, SSE4, AVX
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.5, RdtscTiming=1
Best time for 768K FFT length: 5.768 ms., avg: 5.780 ms.
Best time for 896K FFT length: 7.036 ms., avg: 7.132 ms.
Best time for 1024K FFT length: 7.761 ms., avg: 7.786 ms.
Best time for 1280K FFT length: 10.088 ms., avg: 10.202 ms.
Best time for 1536K FFT length: 12.203 ms., avg: 12.223 ms.
Best time for 1792K FFT length: 14.828 ms., avg: 14.858 ms.
Best time for 2048K FFT length: 16.330 ms., avg: 16.526 ms.
Best time for 2560K FFT length: 20.874 ms., avg: 21.124 ms.
Best time for 3072K FFT length: 25.561 ms., avg: 25.615 ms.
Best time for 3584K FFT length: 30.893 ms., avg: 30.963 ms.
Best time for 4096K FFT length: 34.081 ms., avg: 34.115 ms.
Best time for 5120K FFT length: 44.230 ms., avg: 44.255 ms.
Best time for 6144K FFT length: 55.022 ms., avg: 55.903 ms.
Best time for 7168K FFT length: 67.649 ms., avg: 67.683 ms.
Best time for 8192K FFT length: 73.918 ms., avg: 73.962 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 5.606 ms., avg: 5.673 ms.
Best time for 896K FFT length: 6.766 ms., avg: 6.788 ms.
Best time for 1024K FFT length: 7.532 ms., avg: 7.564 ms.
Best time for 1280K FFT length: 9.729 ms., avg: 9.740 ms.
Best time for 1536K FFT length: 11.923 ms., avg: 11.972 ms.
Best time for 1792K FFT length: 14.366 ms., avg: 14.398 ms.
Best time for 2048K FFT length: 16.066 ms., avg: 16.082 ms.
Best time for 2560K FFT length: 20.293 ms., avg: 20.333 ms.
Best time for 3072K FFT length: 25.148 ms., avg: 25.183 ms.
Best time for 3584K FFT length: 30.046 ms., avg: 30.143 ms.
Best time for 4096K FFT length: 33.637 ms., avg: 33.658 ms.
Best time for 5120K FFT length: 43.546 ms., avg: 43.562 ms.
Best time for 6144K FFT length: 53.692 ms., avg: 54.176 ms.
Best time for 7168K FFT length: 63.256 ms., avg: 63.333 ms.
Best time for 8192K FFT length: 71.144 ms., avg: 71.197 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 2.874 ms., avg: 2.941 ms.
Best time for 896K FFT length: 3.494 ms., avg: 3.569 ms.
Best time for 1024K FFT length: 3.881 ms., avg: 3.898 ms.
Best time for 1280K FFT length: 4.988 ms., avg: 5.105 ms.
Best time for 1536K FFT length: 6.123 ms., avg: 6.142 ms.
Best time for 1792K FFT length: 7.393 ms., avg: 7.401 ms.
Best time for 2048K FFT length: 8.263 ms., avg: 8.272 ms.
Best time for 2560K FFT length: 10.431 ms., avg: 10.443 ms.
Best time for 3072K FFT length: 12.916 ms., avg: 12.931 ms.
Best time for 3584K FFT length: 15.387 ms., avg: 15.406 ms.
Best time for 4096K FFT length: 17.202 ms., avg: 17.228 ms.
Best time for 5120K FFT length: 22.211 ms., avg: 22.510 ms.
Best time for 6144K FFT length: 27.467 ms., avg: 27.489 ms.
Best time for 7168K FFT length: 33.017 ms., avg: 33.587 ms.
Best time for 8192K FFT length: 36.228 ms., avg: 36.415 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 2.177 ms., avg: 2.246 ms.
Best time for 896K FFT length: 2.414 ms., avg: 2.424 ms.
Best time for 1024K FFT length: 2.953 ms., avg: 2.967 ms.
Best time for 1280K FFT length: 3.538 ms., avg: 3.642 ms.
Best time for 1536K FFT length: 4.290 ms., avg: 4.300 ms.
Best time for 1792K FFT length: 5.153 ms., avg: 5.162 ms.
Best time for 2048K FFT length: 5.755 ms., avg: 5.768 ms.
Best time for 2560K FFT length: 7.258 ms., avg: 7.270 ms.
Best time for 3072K FFT length: 8.858 ms., avg: 8.879 ms.
Best time for 3584K FFT length: 10.517 ms., avg: 10.542 ms.
Best time for 4096K FFT length: 11.763 ms., avg: 11.781 ms.
Best time for 5120K FFT length: 15.200 ms., avg: 15.595 ms.
Best time for 6144K FFT length: 18.724 ms., avg: 18.738 ms.
Best time for 7168K FFT length: 24.677 ms., avg: 24.695 ms.
Best time for 8192K FFT length: 24.649 ms., avg: 24.704 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 1.924 ms., avg: 1.930 ms.
Best time for 896K FFT length: 1.915 ms., avg: 1.982 ms.
Best time for 1024K FFT length: 2.618 ms., avg: 2.706 ms.
Best time for 1280K FFT length: 3.095 ms., avg: 3.105 ms.
Best time for 1536K FFT length: 3.644 ms., avg: 3.736 ms.
Best time for 1792K FFT length: 4.053 ms., avg: 4.063 ms.
Best time for 2048K FFT length: 4.602 ms., avg: 4.775 ms.
Best time for 2560K FFT length: 5.919 ms., avg: 6.129 ms.
Best time for 3072K FFT length: 7.033 ms., avg: 7.081 ms.
Best time for 3584K FFT length: 8.238 ms., avg: 8.537 ms.
Best time for 4096K FFT length: 9.314 ms., avg: 9.704 ms.
Best time for 5120K FFT length: 11.926 ms., avg: 12.994 ms.
Best time for 6144K FFT length: 14.707 ms., avg: 14.758 ms.
Best time for 7168K FFT length: 24.780 ms., avg: 25.692 ms.
Best time for 8192K FFT length: 19.411 ms., avg: 19.449 ms.
Best time for 58 bit trial factors: 1.483 ms.
Best time for 59 bit trial factors: 1.532 ms.
Best time for 60 bit trial factors: 1.527 ms.
Best time for 61 bit trial factors: 1.722 ms.
Best time for 62 bit trial factors: 1.713 ms.
Best time for 63 bit trial factors: 1.938 ms.
Best time for 64 bit trial factors: 2.020 ms.
Best time for 65 bit trial factors: 2.358 ms.
Best time for 66 bit trial factors: 2.779 ms.
Best time for 67 bit trial factors: 2.754 ms.

nucleon · 2011-02-13, 05:06

same machine , but 'normal ram speed'

2600k, 1333MHz RAM, running at 45x, ud7 mboard

I have no idea why HT decided to disable itself. Single thread slightly faster,

Code:

Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
CPU speed: 4436.95 MHz, 4 cores
CPU features: Prefetch, MMX, SSE, SSE2, SSE4, AVX
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.5, RdtscTiming=1
Best time for 768K FFT length: 5.698 ms., avg: 5.710 ms.
Best time for 896K FFT length: 6.967 ms., avg: 7.069 ms.
Best time for 1024K FFT length: 7.677 ms., avg: 7.767 ms.
Best time for 1280K FFT length: 9.957 ms., avg: 10.077 ms.
Best time for 1536K FFT length: 12.067 ms., avg: 12.094 ms.
Best time for 1792K FFT length: 14.672 ms., avg: 14.825 ms.
Best time for 2048K FFT length: 16.152 ms., avg: 16.344 ms.
Best time for 2560K FFT length: 20.609 ms., avg: 20.838 ms.
Best time for 3072K FFT length: 25.290 ms., avg: 25.353 ms.
Best time for 3584K FFT length: 30.589 ms., avg: 30.884 ms.
Best time for 4096K FFT length: 33.708 ms., avg: 34.052 ms.
Best time for 5120K FFT length: 43.751 ms., avg: 43.792 ms.
Best time for 6144K FFT length: 54.407 ms., avg: 55.319 ms.
Best time for 7168K FFT length: 66.811 ms., avg: 67.307 ms.
Best time for 8192K FFT length: 73.025 ms., avg: 73.899 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 3.060 ms., avg: 3.070 ms.
Best time for 896K FFT length: 3.711 ms., avg: 3.844 ms.
Best time for 1024K FFT length: 4.119 ms., avg: 4.201 ms.
Best time for 1280K FFT length: 5.257 ms., avg: 5.370 ms.
Best time for 1536K FFT length: 6.289 ms., avg: 6.302 ms.
Best time for 1792K FFT length: 7.774 ms., avg: 7.784 ms.
Best time for 2048K FFT length: 8.550 ms., avg: 8.704 ms.
Best time for 2560K FFT length: 10.905 ms., avg: 11.118 ms.
Best time for 3072K FFT length: 13.310 ms., avg: 13.454 ms.
Best time for 3584K FFT length: 16.108 ms., avg: 16.125 ms.
Best time for 4096K FFT length: 17.781 ms., avg: 17.991 ms.
Best time for 5120K FFT length: 23.050 ms., avg: 23.113 ms.
Best time for 6144K FFT length: 28.580 ms., avg: 28.845 ms.
Best time for 7168K FFT length: 34.960 ms., avg: 35.854 ms.
Best time for 8192K FFT length: 38.430 ms., avg: 38.889 ms.
Timing FFTs using 3 threads.
Best time for 768K FFT length: 2.085 ms., avg: 2.111 ms.
Best time for 896K FFT length: 2.556 ms., avg: 2.593 ms.
Best time for 1024K FFT length: 2.862 ms., avg: 2.935 ms.
Best time for 1280K FFT length: 3.634 ms., avg: 3.768 ms.
Best time for 1536K FFT length: 4.369 ms., avg: 4.514 ms.
Best time for 1792K FFT length: 5.401 ms., avg: 5.535 ms.
Best time for 2048K FFT length: 5.940 ms., avg: 5.975 ms.
Best time for 2560K FFT length: 7.648 ms., avg: 7.740 ms.
Best time for 3072K FFT length: 9.211 ms., avg: 9.353 ms.
Best time for 3584K FFT length: 11.155 ms., avg: 11.192 ms.
Best time for 4096K FFT length: 12.326 ms., avg: 12.679 ms.
Best time for 5120K FFT length: 15.828 ms., avg: 16.245 ms.
Best time for 6144K FFT length: 19.598 ms., avg: 19.709 ms.
Best time for 7168K FFT length: 24.273 ms., avg: 24.902 ms.
Best time for 8192K FFT length: 26.456 ms., avg: 26.676 ms.
Timing FFTs using 4 threads.
Best time for 768K FFT length: 1.605 ms., avg: 1.622 ms.
Best time for 896K FFT length: 1.950 ms., avg: 2.029 ms.
Best time for 1024K FFT length: 2.252 ms., avg: 2.342 ms.
Best time for 1280K FFT length: 2.826 ms., avg: 2.932 ms.
Best time for 1536K FFT length: 3.471 ms., avg: 3.502 ms.
Best time for 1792K FFT length: 4.265 ms., avg: 4.601 ms.
Best time for 2048K FFT length: 4.795 ms., avg: 4.822 ms.
Best time for 2560K FFT length: 6.171 ms., avg: 6.241 ms.
Best time for 3072K FFT length: 7.366 ms., avg: 7.574 ms.
Best time for 3584K FFT length: 8.926 ms., avg: 9.067 ms.
Best time for 4096K FFT length: 10.001 ms., avg: 10.400 ms.
Best time for 5120K FFT length: 12.601 ms., avg: 13.188 ms.
Best time for 6144K FFT length: 15.646 ms., avg: 15.990 ms.
Best time for 7168K FFT length: 21.189 ms., avg: 21.226 ms.
Best time for 8192K FFT length: 21.216 ms., avg: 22.313 ms.
Best time for 58 bit trial factors: 1.483 ms.
Best time for 59 bit trial factors: 1.527 ms.
Best time for 60 bit trial factors: 1.529 ms.
Best time for 61 bit trial factors: 1.721 ms.
Best time for 62 bit trial factors: 1.711 ms.
Best time for 63 bit trial factors: 1.936 ms.
Best time for 64 bit trial factors: 2.023 ms.
Best time for 65 bit trial factors: 2.359 ms.
Best time for 66 bit trial factors: 2.779 ms.
Best time for 67 bit trial factors: 2.753 ms.

Colt45ws · 2011-05-11, 08:33

Wanted to try the new large pages function in the 2.6.38+ kernels. I did this on my EeePC 1000HE.
First benchmark, with it off.

Code:

Intel(R) Atom(TM) CPU N280   @ 1.66GHz
CPU speed: 1694.92 MHz, with hyperthreading
CPU features: Prefetch, MMX, SSE, SSE2
L1 cache size: 24 KB
L2 cache size: 512 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 26.5, RdtscTiming=1
Best time for 768K FFT length: 195.435 ms., avg: 195.514 ms.
Best time for 896K FFT length: 207.027 ms., avg: 207.114 ms.
Best time for 1024K FFT length: 222.541 ms., avg: 222.628 ms.
Best time for 1280K FFT length: 284.854 ms., avg: 284.933 ms.
Best time for 1536K FFT length: 408.128 ms., avg: 408.214 ms.
Best time for 1792K FFT length: 424.064 ms., avg: 424.162 ms.
Best time for 2048K FFT length: 549.841 ms., avg: 549.948 ms.
Best time for 2560K FFT length: 605.698 ms., avg: 605.793 ms.
Best time for 3072K FFT length: 863.554 ms., avg: 863.745 ms.
Best time for 3584K FFT length: 895.740 ms., avg: 895.882 ms.
Best time for 4096K FFT length: 1176.157 ms., avg: 1176.378 ms.
Best time for 5120K FFT length: 1558.754 ms., avg: 1559.197 ms.
Best time for 6144K FFT length: 1586.197 ms., avg: 1586.488 ms.
[Tue May 10 16:16:25 2011]
Best time for 7168K FFT length: 1983.989 ms., avg: 1984.084 ms.
Best time for 8192K FFT length: 2140.437 ms., avg: 2141.372 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 136.866 ms., avg: 137.030 ms.
Best time for 896K FFT length: 146.228 ms., avg: 146.342 ms.
Best time for 1024K FFT length: 155.243 ms., avg: 155.335 ms.
Best time for 1280K FFT length: 202.005 ms., avg: 202.144 ms.
Best time for 1536K FFT length: 285.295 ms., avg: 285.391 ms.
Best time for 1792K FFT length: 302.098 ms., avg: 302.267 ms.
Best time for 2048K FFT length: 384.832 ms., avg: 384.901 ms.
Best time for 2560K FFT length: 431.164 ms., avg: 432.946 ms.
Best time for 3072K FFT length: 616.393 ms., avg: 616.670 ms.
Best time for 3584K FFT length: 639.721 ms., avg: 640.024 ms.
Best time for 4096K FFT length: 829.638 ms., avg: 829.780 ms.
Best time for 5120K FFT length: 1093.714 ms., avg: 1094.350 ms.
Best time for 6144K FFT length: 1125.716 ms., avg: 1126.246 ms.
[Tue May 10 16:22:08 2011]
Best time for 7168K FFT length: 1401.276 ms., avg: 1401.501 ms.
Best time for 8192K FFT length: 1538.880 ms., avg: 1539.723 ms.
Best time for 58 bit trial factors: 18.911 ms.
Best time for 59 bit trial factors: 18.946 ms.
Best time for 60 bit trial factors: 19.006 ms.
Best time for 61 bit trial factors: 18.929 ms.
Best time for 62 bit trial factors: 19.010 ms.
Best time for 63 bit trial factors: 39.383 ms.
Best time for 64 bit trial factors: 39.438 ms.
Best time for 65 bit trial factors: 22.942 ms.
Best time for 66 bit trial factors: 22.789 ms.
Best time for 67 bit trial factors: 22.827 ms.

Well, actually enabled, but on madvise, so effectively off. I tried it disabled completely and the times were identical.

Here they are with it forced on:

Code:

Intel(R) Atom(TM) CPU N280   @ 1.66GHz
CPU speed: 1694.48 MHz, with hyperthreading
CPU features: Prefetch, MMX, SSE, SSE2
L1 cache size: 24 KB
L2 cache size: 512 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 26.5, RdtscTiming=1
Best time for 768K FFT length: 194.857 ms., avg: 195.211 ms.
Best time for 896K FFT length: 205.363 ms., avg: 206.947 ms.
Best time for 1024K FFT length: 221.750 ms., avg: 223.347 ms.
Best time for 1280K FFT length: 283.540 ms., avg: 284.621 ms.
Best time for 1536K FFT length: 406.623 ms., avg: 408.062 ms.
Best time for 1792K FFT length: 422.541 ms., avg: 422.790 ms.
Best time for 2048K FFT length: 546.624 ms., avg: 546.753 ms.
Best time for 2560K FFT length: 602.485 ms., avg: 602.571 ms.
Best time for 3072K FFT length: 858.861 ms., avg: 858.986 ms.
Best time for 3584K FFT length: 889.080 ms., avg: 889.305 ms.
Best time for 4096K FFT length: 1163.558 ms., avg: 1164.616 ms.
Best time for 5120K FFT length: 1539.612 ms., avg: 1540.768 ms.
Best time for 6144K FFT length: 1562.943 ms., avg: 1565.266 ms.
[Tue May 10 17:23:44 2011]
Best time for 7168K FFT length: 1960.589 ms., avg: 1960.829 ms.
Best time for 8192K FFT length: 2124.610 ms., avg: 2126.358 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 136.300 ms., avg: 136.353 ms.
Best time for 896K FFT length: 145.393 ms., avg: 145.626 ms.
Best time for 1024K FFT length: 155.212 ms., avg: 155.487 ms.
Best time for 1280K FFT length: 201.103 ms., avg: 201.220 ms.
Best time for 1536K FFT length: 284.599 ms., avg: 284.713 ms.
Best time for 1792K FFT length: 299.223 ms., avg: 299.429 ms.
Best time for 2048K FFT length: 383.836 ms., avg: 383.886 ms.
Best time for 2560K FFT length: 428.195 ms., avg: 428.358 ms.
Best time for 3072K FFT length: 603.362 ms., avg: 603.654 ms.
Best time for 3584K FFT length: 636.113 ms., avg: 636.256 ms.
Best time for 4096K FFT length: 820.119 ms., avg: 820.228 ms.
Best time for 5120K FFT length: 1082.455 ms., avg: 1083.740 ms.
Best time for 6144K FFT length: 1115.927 ms., avg: 1116.729 ms.
[Tue May 10 17:29:26 2011]
Best time for 7168K FFT length: 1390.900 ms., avg: 1391.043 ms.
Best time for 8192K FFT length: 1526.675 ms., avg: 1529.076 ms.
Best time for 58 bit trial factors: 18.932 ms.
Best time for 59 bit trial factors: 18.943 ms.
Best time for 60 bit trial factors: 19.008 ms.
Best time for 61 bit trial factors: 18.933 ms.
Best time for 62 bit trial factors: 19.015 ms.
Best time for 63 bit trial factors: 39.372 ms.
Best time for 64 bit trial factors: 39.414 ms.
Best time for 65 bit trial factors: 22.948 ms.
Best time for 66 bit trial factors: 22.806 ms.
Best time for 67 bit trial factors: 22.822 ms.

The performance improvement hovers right around 1%; negligible. It didnt affect TF at all.

LiquidNitrogen · 2011-07-05, 18:15

Quote:

Originally Posted by abstractalgebra

Fair question, the CPU defaults to 3.3GHz but my overlocked turbo boosts to 4.6 GHz. With Sandy Bridge you can't just increase the default GHz

There is a way to have a sustained clock speed (mine is 5.1 GHz on the i5-2500K) for 24x7 operation but it works best for chips with no hyperthreading, or hyperthreading turned off in the BIOS.

ciic · 2011-08-04, 04:36

Hi !
-------------------------------------------------------------------------------------------------------------------
Here's just some perf data on the new Sandy Bridge Pentium:

Intel(R) Pentium(R) CPU G620T @ 2.20GHz 35W TDP (System ~40-45W)

Please compare with the specs of an Intel Core i-5 2500K @ 2200 MHz (single thread perf)! Striking!!
See: http://mersenne-aries.sili.net/throughput.php?cpu1=Intel%28R%29+Core%28TM%29+i5-2500K+CPU+%40+3.30GHz|256|6144&mhz1=2159
__________________________________________________________________
[Thu Aug 4 04:25:30 2011]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Pentium(R) CPU G620T @ 2.20GHz
CPU speed: 2160.98 MHz, 2 cores
CPU features: Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 3 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.6, RdtscTiming=1
Best time for 768K FFT length: 12.232 ms., avg: 13.653 ms.
Best time for 896K FFT length: 15.825 ms., avg: 18.045 ms.
Best time for 1024K FFT length: 17.294 ms., avg: 21.854 ms.
Best time for 1280K FFT length: 23.775 ms., avg: 29.384 ms.
Best time for 1536K FFT length: 27.425 ms., avg: 28.246 ms.
Best time for 1792K FFT length: 33.410 ms., avg: 34.396 ms.
Best time for 2048K FFT length: 36.924 ms., avg: 37.782 ms.
Best time for 2560K FFT length: 47.147 ms., avg: 51.428 ms.
Best time for 3072K FFT length: 57.876 ms., avg: 69.091 ms.
Best time for 3584K FFT length: 63.242 ms., avg: 63.406 ms.
Best time for 4096K FFT length: 69.737 ms., avg: 70.164 ms.
Best time for 5120K FFT length: 90.425 ms., avg: 90.757 ms.
Best time for 6144K FFT length: 112.508 ms., avg: 112.865 ms.
Best time for 7168K FFT length: 137.033 ms., avg: 137.584 ms.
Best time for 8192K FFT length: 149.157 ms., avg: 149.617 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 6.354 ms., avg: 6.505 ms.
Best time for 896K FFT length: 7.805 ms., avg: 7.827 ms.
Best time for 1024K FFT length: 8.462 ms., avg: 8.571 ms.
Best time for 1280K FFT length: 10.826 ms., avg: 10.851 ms.
Best time for 1536K FFT length: 12.940 ms., avg: 13.032 ms.
Best time for 1792K FFT length: 16.176 ms., avg: 16.751 ms.
Best time for 2048K FFT length: 17.773 ms., avg: 18.175 ms.
Best time for 2560K FFT length: 22.521 ms., avg: 22.682 ms.
Best time for 3072K FFT length: 27.753 ms., avg: 27.791 ms.
Best time for 3584K FFT length: 33.201 ms., avg: 33.333 ms.
Best time for 4096K FFT length: 36.267 ms., avg: 36.351 ms.
Best time for 5120K FFT length: 47.869 ms., avg: 47.995 ms.
Best time for 6144K FFT length: 58.741 ms., avg: 58.871 ms.
Best time for 7168K FFT length: 78.985 ms., avg: 79.574 ms.
Best time for 8192K FFT length: 79.208 ms., avg: 79.566 ms.
Best time for 61 bit trial factors: 3.601 ms.
Best time for 62 bit trial factors: 3.640 ms.
Best time for 63 bit trial factors: 4.084 ms.
Best time for 64 bit trial factors: 4.258 ms.
Best time for 65 bit trial factors: 4.955 ms.
Best time for 66 bit trial factors: 5.825 ms.
Best time for 67 bit trial factors: 5.775 ms.
Best time for 75 bit trial factors: 5.618 ms.
Best time for 76 bit trial factors: 5.610 ms.
Best time for 77 bit trial factors: 5.612 ms.
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Pentium(R) CPU G620T @ 2.20GHz
CPU speed: 2159.88 MHz, 2 cores
CPU features: Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 3 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 26.6, RdtscTiming=1
Best time for 768K FFT length: 11.917 ms., avg: 11.989 ms.
Best time for 896K FFT length: 14.523 ms., avg: 14.609 ms.
Best time for 1024K FFT length: 15.931 ms., avg: 16.253 ms.
Best time for 1280K FFT length: 20.580 ms., avg: 20.690 ms.
Best time for 1536K FFT length: 25.084 ms., avg: 25.369 ms.
Best time for 1792K FFT length: 30.315 ms., avg: 30.338 ms.
Best time for 2048K FFT length: 33.503 ms., avg: 33.629 ms.
Best time for 2560K FFT length: 42.696 ms., avg: 42.854 ms.
Best time for 3072K FFT length: 52.339 ms., avg: 63.321 ms.
Best time for 3584K FFT length: 63.579 ms., avg: 67.413 ms.
Best time for 4096K FFT length: 69.136 ms., avg: 69.679 ms.
Best time for 5120K FFT length: 89.757 ms., avg: 90.067 ms.
Best time for 6144K FFT length: 111.597 ms., avg: 111.970 ms.
Best time for 7168K FFT length: 137.051 ms., avg: 137.556 ms.
[Thu Aug 4 04:30:36 2011]
Best time for 8192K FFT length: 149.193 ms., avg: 149.655 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 6.344 ms., avg: 6.413 ms.
Best time for 896K FFT length: 7.787 ms., avg: 7.860 ms.
Best time for 1024K FFT length: 8.477 ms., avg: 8.534 ms.
Best time for 1280K FFT length: 10.806 ms., avg: 10.827 ms.
Best time for 1536K FFT length: 13.014 ms., avg: 13.105 ms.
Best time for 1792K FFT length: 16.015 ms., avg: 16.087 ms.
Best time for 2048K FFT length: 17.940 ms., avg: 17.994 ms.
Best time for 2560K FFT length: 22.434 ms., avg: 22.470 ms.
Best time for 3072K FFT length: 27.897 ms., avg: 28.022 ms.
Best time for 3584K FFT length: 33.418 ms., avg: 33.575 ms.
Best time for 4096K FFT length: 36.684 ms., avg: 36.849 ms.
Best time for 5120K FFT length: 47.364 ms., avg: 47.534 ms.
Best time for 6144K FFT length: 58.353 ms., avg: 58.592 ms.
Best time for 7168K FFT length: 78.334 ms., avg: 78.730 ms.
Best time for 8192K FFT length: 78.627 ms., avg: 79.162 ms.
Best time for 61 bit trial factors: 3.601 ms.
Best time for 62 bit trial factors: 3.640 ms.
Best time for 63 bit trial factors: 4.085 ms.
Best time for 64 bit trial factors: 4.258 ms.
Best time for 65 bit trial factors: 4.959 ms.
Best time for 66 bit trial factors: 5.823 ms.
Best time for 67 bit trial factors: 5.779 ms.
Best time for 75 bit trial factors: 5.621 ms.
Best time for 76 bit trial factors: 5.613 ms.
Best time for 77 bit trial factors: 5.611 ms.
[Thu Aug 4 04:34:55 2011]

James Heinrich · 2011-08-04, 10:43

Quote:

Originally Posted by ciic

Please compare with the specs of an Intel Core i-5 2500K @ 2200 MHz (single thread perf)! Striking!!

Here is the actual comparison between the two CPUs. At the same clock speed (2160MHz), other than a small difference between 1MB and 3MB FFT sizes, performance is nearly identical.

davieddy · 2011-08-04, 12:45

Quote:

Originally Posted by James Heinrich

Here is the actual comparison between the two CPUs. At the same clock speed (2160MHz), other than a small difference between 1MB and 3MB FFT sizes, performance is nearly identical.

What means the "B" in "FFT size"?

David

PS Please my German word-ordnung excuse

James Heinrich · 2011-08-04, 19:50

Quote:

Originally Posted by davieddy

What means the "B" in "FFT size"?

Das "B" ist für "Byte", und der "M" in der infrontovem platz ist für "Mega". Also, wir haven der "MegaByte".

...Sorry, got caught up in the spirit of pseudodeutch

Was that even your question? The only place I see "B" is in my above quote about 1MB-3MB, which would be 1024K-3072K FFT sizes (or 1048576-3145728 if you prefer), as illustrated by the attached graph.

davieddy · 2011-08-04, 22:29

Quote:

Originally Posted by James Heinrich

Das "B" ist für "Byte", und der "M" in der infrontovem platz ist für "Mega". Also, wir haven der "MegaByte".

...Sorry, got caught up in the spirit of pseudodeutch

Was that even your question? The only place I see "B" is in my above quote about 1MB-3MB, which would be 1024K-3072K FFT sizes (or 1048576-3145728 if you prefer), as illustrated by the attached graph.

Jawohl. Ich habe already das alle gotten. Aber ein Bischen FFT nein = ein Bischen whatever ist fur "memory" zee Deutch (Ich vergesse). Nicht Wahr?

David

PS Ernst has been giving me some private tuition recently!

PPS I didn't the Krieg mention.... well I may have done
once, but I think I got away with it.

2009-11-14, 08:13	#501
moebius Jul 2009 Germany 607 Posts	Phenom X4 955 BE @3.6 Ghz AMD Phenom(tm) II X4 955 Processor CPU speed: 3616.00 MHz, 4 cores CPU features: RDTSC, CMOV, Prefetch, 3DNow!, MMX, SSE, SSE2 L1 cache size: 64 KB L2 cache size: 512 KB, L3 cache size: 6 MB L1 cache line size: 64 bytes L2 cache line size: 64 bytes L1 TLBS: 48 L2 TLBS: 512 Prime95 32-bit version 25.9, RdtscTiming=1 Best time for 768K FFT length: 11.699 ms. Best time for 896K FFT length: 14.233 ms. Best time for 1024K FFT length: 16.163 ms. Best time for 1280K FFT length: 20.475 ms. Best time for 1536K FFT length: 24.505 ms. Best time for 1792K FFT length: 30.001 ms. Best time for 2048K FFT length: 33.958 ms. Best time for 2560K FFT length: 44.735 ms. Best time for 3072K FFT length: 53.441 ms. Best time for 3584K FFT length: 64.947 ms. Best time for 4096K FFT length: 73.566 ms. Best time for 5120K FFT length: 97.125 ms. Best time for 6144K FFT length: 122.152 ms. Best time for 7168K FFT length: 151.038 ms. Best time for 8192K FFT length: 172.531 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 8.468 ms. Best time for 896K FFT length: 10.997 ms. Best time for 1024K FFT length: 13.325 ms. Best time for 1280K FFT length: 15.862 ms. Best time for 1536K FFT length: 19.257 ms. Best time for 1792K FFT length: 22.824 ms. Best time for 2048K FFT length: 26.030 ms. Best time for 2560K FFT length: 34.687 ms. Best time for 3072K FFT length: 41.220 ms. Best time for 3584K FFT length: 48.786 ms. Best time for 4096K FFT length: 54.699 ms. Best time for 5120K FFT length: 54.464 ms. Best time for 6144K FFT length: 66.127 ms. Best time for 7168K FFT length: 79.969 ms. Best time for 8192K FFT length: 90.241 ms. Timing FFTs using 3 threads. Best time for 768K FFT length: 6.321 ms. Best time for 896K FFT length: 7.336 ms. Best time for 1024K FFT length: 8.395 ms. Best time for 1280K FFT length: 14.364 ms. Best time for 1536K FFT length: 16.925 ms. Best time for 1792K FFT length: 19.806 ms. Best time for 2048K FFT length: 22.407 ms. Best time for 2560K FFT length: 30.807 ms. Best time for 3072K FFT length: 36.088 ms. Best time for 3584K FFT length: 41.646 ms. Best time for 4096K FFT length: 46.496 ms. Best time for 5120K FFT length: 38.431 ms. Best time for 6144K FFT length: 46.875 ms. Best time for 7168K FFT length: 56.333 ms. Best time for 8192K FFT length: 63.816 ms. Timing FFTs using 4 threads. Best time for 768K FFT length: 5.813 ms. Best time for 896K FFT length: 7.073 ms. Best time for 1024K FFT length: 8.070 ms. Best time for 1280K FFT length: 13.518 ms. Best time for 1536K FFT length: 16.056 ms. Best time for 1792K FFT length: 19.021 ms. Best time for 2048K FFT length: 21.272 ms. Best time for 2560K FFT length: 29.128 ms. Best time for 3072K FFT length: 34.316 ms. Best time for 3584K FFT length: 39.276 ms. Best time for 4096K FFT length: 43.892 ms. Best time for 5120K FFT length: 32.375 ms. Best time for 6144K FFT length: 38.699 ms. Best time for 7168K FFT length: 46.024 ms. Best time for 8192K FFT length: 51.565 ms. Best time for 58 bit trial factors: 3.211 ms. Best time for 59 bit trial factors: 3.214 ms. Best time for 60 bit trial factors: 3.234 ms. Best time for 61 bit trial factors: 3.218 ms. Best time for 62 bit trial factors: 3.224 ms. Best time for 63 bit trial factors: 5.929 ms. Best time for 64 bit trial factors: 5.921 ms. Best time for 65 bit trial factors: 5.907 ms. Best time for 66 bit trial factors: 5.862 ms. Best time for 67 bit trial factors: 5.876 ms.

2009-11-16, 11:55	#502
lycorn "GIMFS" Sep 2002 Oeiras, Portugal 2×11×67 Posts	Suggestion As we have been made aware by many benchmarks already posted in this forum, Prime 95 doesn´t scale very well as the number of threads per test goes up. That´s an established fact. Now what would be interesting to post, in my opinion, is the per iteration times when the number of worker windows (each one single threaded) goes up. That gives a good indication of whether we should use a given multi core CPU just for LL work (one test per core). If the iteration times are getting real worse with more workers running, it is then probably better to switch on or two cores to TF, for example. As far as I could see, this type of benchmark hasn´t been posted much. I therefore suggest that we start posting this type of data, particularly for quad cores. Last fiddled with by lycorn on 2009-11-16 at 11:55

2010-03-15, 05:00	#512
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3×5×313 Posts	VERY ODD results ... anyone have any suggestions? I just installed Prime95 on: Code: Software Version Windows,Prime95,v25.9,build 4 Model AMD Athlon Dual-Core QL-62 Features Dual core, Prefetch,3DNow!,SSE,SSE2 Speed 1.999 GHz (1.765 GHz P4 effective equivalent) L1/L2 Cache 64 / 512 KB Computer Memory 2814 MB configured usage 1000 MB day / 1000 MB night --- it has 3 GB of RAM I started with Worker 1: P-1; Worker 2: DC The iterations times seemed high for a DC (0.130) so I ran a benchmark. The results really surprised me. With 1 core the numbers seemed low: i.e. 63 Ms for 1280 FFT But when it went to 1 core/1 helper it got very weird: the iterations time went up by about 40% to about 80 ms for 1280FFT; and every other FFT below 7K (at which time they were slightly better than 1 core). So I changed both cores to DC. With only 1 worker active running DC I was getting iterations times of about 70 ms. When the second DC worker started both iterations times dropped to 132 ms. Task manager showed Prime95 consistently in the 98-99% range. Any thoughts? Anyone help?

2010-04-06, 20:10	#516
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 3·5·313 Posts	Deleting benchmarks??? One the benchmark page there is a "Delete?" column but no corresponding "Delete" button or option. Am I missing something OR is this feature not fully implemented yet?

2010-04-12, 02:24	#522
satchvai Apr 2010 4₁₆ Posts	4.2Ghz i7 on Air Compare your results to other computers at http://www.mersenne.org/report_benchmarks Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz CPU speed: 4010.23 MHz, 8 cores CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4 L1 cache size: 32 KB L2 cache size: 256 KB, L3 cache size: 8 MB L1 cache line size: 64 bytes L2 cache line size: 64 bytes TLBS: 64 Prime95 64-bit version 25.11, RdtscTiming=1 Best time for 768K FFT length: 8.748 ms. Best time for 896K FFT length: 10.609 ms. Best time for 1024K FFT length: 11.955 ms. Best time for 1280K FFT length: 15.069 ms. Best time for 1536K FFT length: 18.196 ms. Best time for 1792K FFT length: 21.953 ms. Best time for 2048K FFT length: 24.804 ms. Best time for 2560K FFT length: 33.066 ms. Best time for 3072K FFT length: 40.369 ms. Best time for 3584K FFT length: 48.992 ms. Best time for 4096K FFT length: 55.264 ms. Best time for 5120K FFT length: 70.915 ms. Best time for 6144K FFT length: 84.439 ms. Best time for 7168K FFT length: 102.407 ms. Best time for 8192K FFT length: 115.802 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 9.000 ms. Best time for 896K FFT length: 10.978 ms. Best time for 1024K FFT length: 12.365 ms. Best time for 1280K FFT length: 15.738 ms. Best time for 1536K FFT length: 18.689 ms. Best time for 1792K FFT length: 22.990 ms. Best time for 2048K FFT length: 25.284 ms. Best time for 2560K FFT length: 33.789 ms. Best time for 3072K FFT length: 40.301 ms. Best time for 3584K FFT length: 49.153 ms. Best time for 4096K FFT length: 54.548 ms. Best time for 5120K FFT length: 70.452 ms. Best time for 6144K FFT length: 84.298 ms. [Sun Apr 11 22:16:12 2010] Best time for 7168K FFT length: 101.948 ms. Best time for 8192K FFT length: 112.960 ms. Timing FFTs using 3 threads. Best time for 768K FFT length: 5.325 ms. Best time for 896K FFT length: 6.410 ms. Best time for 1024K FFT length: 7.859 ms. Best time for 1280K FFT length: 9.127 ms. Best time for 1536K FFT length: 10.830 ms. Best time for 1792K FFT length: 13.346 ms. Best time for 2048K FFT length: 14.706 ms. Best time for 2560K FFT length: 19.739 ms. Best time for 3072K FFT length: 23.589 ms. Best time for 3584K FFT length: 29.010 ms. Best time for 4096K FFT length: 32.161 ms. Best time for 5120K FFT length: 41.749 ms. Best time for 6144K FFT length: 49.773 ms. Best time for 7168K FFT length: 60.770 ms. Best time for 8192K FFT length: 67.212 ms. Timing FFTs using 4 threads. Best time for 768K FFT length: 5.239 ms. Best time for 896K FFT length: 6.012 ms. Best time for 1024K FFT length: 7.485 ms. Best time for 1280K FFT length: 8.164 ms. Best time for 1536K FFT length: 9.737 ms. Best time for 1792K FFT length: 11.774 ms. Best time for 2048K FFT length: 13.204 ms. Best time for 2560K FFT length: 17.438 ms. Best time for 3072K FFT length: 20.702 ms. Best time for 3584K FFT length: 25.156 ms. Best time for 4096K FFT length: 28.004 ms. Best time for 5120K FFT length: 36.315 ms. Best time for 6144K FFT length: 43.531 ms. Best time for 7168K FFT length: 52.476 ms. Best time for 8192K FFT length: 58.572 ms. Timing FFTs using 5 threads. Best time for 768K FFT length: 4.227 ms. Best time for 896K FFT length: 4.897 ms. Best time for 1024K FFT length: 6.268 ms. Best time for 1280K FFT length: 6.327 ms. Best time for 1536K FFT length: 7.528 ms. Best time for 1792K FFT length: 8.753 ms. Best time for 2048K FFT length: 9.929 ms. Best time for 2560K FFT length: 12.952 ms. Best time for 3072K FFT length: 15.537 ms. Best time for 3584K FFT length: 18.795 ms. Best time for 4096K FFT length: 21.202 ms. Best time for 5120K FFT length: 27.590 ms. Best time for 6144K FFT length: 33.947 ms. Best time for 7168K FFT length: 41.614 ms. Best time for 8192K FFT length: 46.205 ms. Timing FFTs using 6 threads. Best time for 768K FFT length: 4.374 ms. Best time for 896K FFT length: 5.041 ms. Best time for 1024K FFT length: 6.417 ms. Best time for 1280K FFT length: 6.577 ms. Best time for 1536K FFT length: 7.834 ms. Best time for 1792K FFT length: 9.142 ms. Best time for 2048K FFT length: 10.316 ms. Best time for 2560K FFT length: 12.859 ms. Best time for 3072K FFT length: 15.444 ms. Best time for 3584K FFT length: 17.986 ms. Best time for 4096K FFT length: 20.469 ms. Best time for 5120K FFT length: 25.563 ms. Best time for 6144K FFT length: 33.007 ms. Best time for 7168K FFT length: 39.752 ms. Best time for 8192K FFT length: 45.174 ms. Timing FFTs using 7 threads. Best time for 768K FFT length: 3.862 ms. Best time for 896K FFT length: 4.428 ms. Best time for 1024K FFT length: 5.757 ms. Best time for 1280K FFT length: 5.785 ms. Best time for 1536K FFT length: 6.906 ms. Best time for 1792K FFT length: 7.948 ms. Best time for 2048K FFT length: 9.040 ms. Best time for 2560K FFT length: 11.260 ms. Best time for 3072K FFT length: 13.422 ms. Best time for 3584K FFT length: 15.612 ms. Best time for 4096K FFT length: 17.833 ms. Best time for 5120K FFT length: 22.291 ms. Best time for 6144K FFT length: 29.035 ms. Best time for 7168K FFT length: 35.325 ms. Best time for 8192K FFT length: 40.729 ms. Timing FFTs using 8 threads. Best time for 768K FFT length: 4.046 ms. Best time for 896K FFT length: 4.623 ms. Best time for 1024K FFT length: 5.981 ms. Best time for 1280K FFT length: 6.094 ms. Best time for 1536K FFT length: 7.288 ms. Best time for 1792K FFT length: 8.436 ms. Best time for 2048K FFT length: 9.578 ms. Best time for 2560K FFT length: 11.928 ms. Best time for 3072K FFT length: 14.181 ms. Best time for 3584K FFT length: 16.611 ms. Best time for 4096K FFT length: 18.990 ms. Best time for 5120K FFT length: 23.572 ms. Best time for 6144K FFT length: 30.192 ms. Best time for 7168K FFT length: 36.903 ms. Best time for 8192K FFT length: 42.362 ms. Best time for 58 bit trial factors: 1.839 ms. Best time for 59 bit trial factors: 1.859 ms. Best time for 60 bit trial factors: 1.858 ms. Best time for 61 bit trial factors: 2.053 ms. Best time for 62 bit trial factors: 2.170 ms. Best time for 63 bit trial factors: 2.563 ms. Best time for 64 bit trial factors: 3.076 ms. Best time for 65 bit trial factors: 3.342 ms. Best time for 66 bit trial factors: 3.496 ms. Best time for 67 bit trial factors: 3.469 ms.

2010-03-15, 08:32	#513
lycorn "GIMFS" Sep 2002 Oeiras, Portugal 1474₁₀ Posts	The QL-62 works with DDR2-667 (333 MHz Bus speed). It´s not much in terms of mem bandwith. I would say that might be the limiting factor in the benchies you posted. The way the numbers vary suggests some memory access congestion.

2010-03-15, 23:46	#515
lycorn "GIMFS" Sep 2002 Oeiras, Portugal 2·11·67 Posts	Try one core DC and one core TF.

2010-04-12, 17:49	#523
lavalamp Oct 2007 Manchester, UK 23·59 Posts	That's mighty impressive to be stable at 4.2 GHz on air. What's your setup?

2010-04-15, 15:39	#527
satchvai Apr 2010 2² Posts	4.2GHZ i7 on Air No HT Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz CPU speed: 4010.07 MHz, 4 cores CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4 L1 cache size: 32 KB L2 cache size: 256 KB, L3 cache size: 8 MB L1 cache line size: 64 bytes L2 cache line size: 64 bytes TLBS: 64 Prime95 64-bit version 25.11, RdtscTiming=1 Best time for 768K FFT length: 8.739 ms. Best time for 896K FFT length: 10.663 ms. Best time for 1024K FFT length: 11.947 ms. Best time for 1280K FFT length: 15.056 ms. Best time for 1536K FFT length: 18.175 ms. Best time for 1792K FFT length: 21.964 ms. Best time for 2048K FFT length: 24.790 ms. Best time for 2560K FFT length: 33.015 ms. Best time for 3072K FFT length: 40.258 ms. Best time for 3584K FFT length: 48.918 ms. Best time for 4096K FFT length: 55.184 ms. Best time for 5120K FFT length: 70.805 ms. Best time for 6144K FFT length: 84.363 ms. Best time for 7168K FFT length: 102.260 ms. Best time for 8192K FFT length: 115.184 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 4.588 ms. Best time for 896K FFT length: 5.542 ms. Best time for 1024K FFT length: 6.371 ms. Best time for 1280K FFT length: 7.922 ms. Best time for 1536K FFT length: 9.590 ms. Best time for 1792K FFT length: 11.566 ms. Best time for 2048K FFT length: 13.052 ms. Best time for 2560K FFT length: 17.144 ms. Best time for 3072K FFT length: 20.770 ms. Best time for 3584K FFT length: 25.189 ms. Best time for 4096K FFT length: 28.386 ms. Best time for 5120K FFT length: 36.479 ms. Best time for 6144K FFT length: 43.749 ms. Best time for 7168K FFT length: 53.097 ms. Best time for 8192K FFT length: 59.952 ms. Timing FFTs using 3 threads. Best time for 768K FFT length: 3.544 ms. Best time for 896K FFT length: 4.037 ms. Best time for 1024K FFT length: 5.365 ms. Best time for 1280K FFT length: 5.348 ms. Best time for 1536K FFT length: 6.434 ms. Best time for 1792K FFT length: 7.814 ms. Best time for 2048K FFT length: 8.771 ms. Best time for 2560K FFT length: 11.590 ms. Best time for 3072K FFT length: 14.075 ms. Best time for 3584K FFT length: 17.104 ms. Best time for 4096K FFT length: 19.345 ms. Best time for 5120K FFT length: 25.538 ms. Best time for 6144K FFT length: 32.499 ms. Best time for 7168K FFT length: 39.316 ms. Best time for 8192K FFT length: 44.946 ms. Timing FFTs using 4 threads. Best time for 768K FFT length: 3.149 ms. Best time for 896K FFT length: 3.593 ms. Best time for 1024K FFT length: 4.774 ms. Best time for 1280K FFT length: 4.500 ms. Best time for 1536K FFT length: 5.356 ms. Best time for 1792K FFT length: 6.191 ms. Best time for 2048K FFT length: 7.063 ms. Best time for 2560K FFT length: 8.911 ms. Best time for 3072K FFT length: 10.778 ms. Best time for 3584K FFT length: 13.120 ms. Best time for 4096K FFT length: 15.068 ms. Best time for 5120K FFT length: 19.265 ms. Best time for 6144K FFT length: 24.122 ms. Best time for 7168K FFT length: 30.698 ms. Best time for 8192K FFT length: 36.146 ms. Best time for 58 bit trial factors: 1.839 ms. Best time for 59 bit trial factors: 1.859 ms. Best time for 60 bit trial factors: 1.857 ms. Best time for 61 bit trial factors: 2.052 ms. Best time for 62 bit trial factors: 2.169 ms. Best time for 63 bit trial factors: 2.563 ms. Best time for 64 bit trial factors: 3.157 ms. Best time for 65 bit trial factors: 3.337 ms. Best time for 66 bit trial factors: 3.496 ms. Best time for 67 bit trial factors: 3.468 ms. Last fiddled with by satchvai on 2010-04-15 at 15:40

2010-12-05, 09:55	#528
Colt45ws Jun 2010 17 Posts	I have noticed the same thing on my i7. Im running 4010MHz as well, though I had to bump it to 1.34VCore. I left HTT enabled in BIOS but disabled it in the Prime95 config. Speedup is about 5ms per iteration depending on FFT size and it burns about 15W less electrical power according to Gigabyte DES. I checked the same thing on my Prescott P4 and Atom, the effect was the opposite. Slower, and much slower on the Atom. The way I interpret this, is P95 is utilizing the capability of an i7 core well enough, that there is not much in the way of resources left for the 'fake' thread to utilize, or the way its splitting the load does not work well with it. Last fiddled with by Colt45ws on 2010-12-05 at 10:01

2011-01-20, 07:03	#529
abstractalgebra Jan 2011 4₁₆ Posts	I5-2500k Sandy Bridge Benchmark Turbo Overclocked to 4.1GHz, 1333 DDR3, Unbuntu 10.10, mprime 2511-64bit. Stock cooler, will post more benchmarks speed increases. 4.4-4.6 appears to be common with ~5Ghz if rather lucky Hit enter to continue: [Main thread Jan 20 01:52] Starting worker. [Worker #1 Jan 20 01:52] Worker starting [Worker #1 Jan 20 01:52] Setting affinity to run worker on logical CPU #0 [Worker #1 Jan 20 01:52] Your timings will be written to the results.txt file. [Worker #1 Jan 20 01:52] Compare your results to other computers at http://www.mersenne.org/report_benchmarks [Worker #1 Jan 20 01:52] Timing 55 iterations at 768K FFT length. Best time: 6.818 ms. [Worker #1 Jan 20 01:52] Timing 47 iterations at 896K FFT length. Best time: 8.416 ms. [Worker #1 Jan 20 01:52] Timing 41 iterations at 1024K FFT length. Best time: 9.397 ms. [Worker #1 Jan 20 01:53] Timing 33 iterations at 1280K FFT length. Best time: 11.923 ms. [Worker #1 Jan 20 01:53] Timing 27 iterations at 1536K FFT length. Best time: 14.280 ms. [Worker #1 Jan 20 01:53] Timing 23 iterations at 1792K FFT length. Best time: 17.603 ms. [Worker #1 Jan 20 01:53] Timing 20 iterations at 2048K FFT length. Best time: 19.479 ms. [Worker #1 Jan 20 01:53] Timing 16 iterations at 2560K FFT length. Best time: 26.130 ms. [Worker #1 Jan 20 01:53] Timing 13 iterations at 3072K FFT length. Best time: 31.586 ms. [Worker #1 Jan 20 01:53] Timing 11 iterations at 3584K FFT length. Best time: 38.991 ms. [Worker #1 Jan 20 01:53] Timing 10 iterations at 4096K FFT length. Best time: 43.271 ms. [Worker #1 Jan 20 01:53] Timing 10 iterations at 5120K FFT length. Best time: 55.765 ms. [Worker #1 Jan 20 01:53] Timing 10 iterations at 6144K FFT length. Best time: 66.860 ms. [Worker #1 Jan 20 01:53] Timing 10 iterations at 7168K FFT length. Best time: 81.550 ms. [Worker #1 Jan 20 01:53] Timing 10 iterations at 8192K FFT length. Best time: 91.063 ms.

2011-01-22, 15:43	#533
abstractalgebra Jan 2011 4₁₆ Posts	i5-2500K overclocked by turbo to 4.59Ghz w/1600Mhz XMP RAM (defaults) [Sat Jan 22 10:38:54 2011] Compare your results to other computers at http://www.mersenne.org/report_benchmarks Intel(R) Core(TM) i5-2500K CPU @ 3.30GHz CPU speed: 3292.69 MHz, 4 cores CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4 L1 cache size: unknown L2 cache size: 256 KB, L3 cache size: 6 MB L1 cache line size: unknown L2 cache line size: 64 bytes TLBS: 64 Prime95 64-bit version 26.4, RdtscTiming=1 Best time for 768K FFT length: 5.598 ms., avg: 5.699 ms. Best time for 896K FFT length: 6.896 ms., avg: 6.935 ms. Best time for 1024K FFT length: 7.514 ms., avg: 7.639 ms. Best time for 1280K FFT length: 9.756 ms., avg: 9.911 ms. Best time for 1536K FFT length: 11.813 ms., avg: 11.993 ms. Best time for 1792K FFT length: 14.354 ms., avg: 14.370 ms. Best time for 2048K FFT length: 15.807 ms., avg: 15.844 ms. Best time for 2560K FFT length: 20.169 ms., avg: 20.199 ms. Best time for 3072K FFT length: 24.739 ms., avg: 24.791 ms. Best time for 3584K FFT length: 29.892 ms., avg: 29.951 ms. Best time for 4096K FFT length: 33.029 ms., avg: 33.077 ms. Best time for 5120K FFT length: 42.875 ms., avg: 42.908 ms. Best time for 6144K FFT length: 53.270 ms., avg: 53.807 ms. Best time for 7168K FFT length: 65.453 ms., avg: 65.904 ms. Best time for 8192K FFT length: 71.324 ms., avg: 72.243 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 3.022 ms., avg: 3.048 ms. Best time for 896K FFT length: 3.677 ms., avg: 3.856 ms. Best time for 1024K FFT length: 4.035 ms., avg: 4.128 ms. Best time for 1280K FFT length: 5.150 ms., avg: 5.292 ms. Best time for 1536K FFT length: 6.131 ms., avg: 6.144 ms. Best time for 1792K FFT length: 7.581 ms., avg: 7.793 ms. Best time for 2048K FFT length: 8.344 ms., avg: 8.379 ms. Best time for 2560K FFT length: 10.628 ms., avg: 10.903 ms. Best time for 3072K FFT length: 12.972 ms., avg: 13.322 ms. Best time for 3584K FFT length: 15.672 ms., avg: 15.881 ms. Best time for 4096K FFT length: 17.281 ms., avg: 17.750 ms. Best time for 5120K FFT length: 22.446 ms., avg: 22.583 ms. Best time for 6144K FFT length: 27.890 ms., avg: 28.191 ms. Best time for 7168K FFT length: 34.689 ms., avg: 35.205 ms. Best time for 8192K FFT length: 37.308 ms., avg: 37.414 ms. Timing FFTs using 3 threads. Best time for 768K FFT length: 2.078 ms., avg: 2.122 ms. Best time for 896K FFT length: 2.563 ms., avg: 2.664 ms. Best time for 1024K FFT length: 2.816 ms., avg: 2.968 ms. Best time for 1280K FFT length: 3.561 ms., avg: 3.649 ms. Best time for 1536K FFT length: 4.219 ms., avg: 4.327 ms. Best time for 1792K FFT length: 5.210 ms., avg: 5.251 ms. Best time for 2048K FFT length: 5.765 ms., avg: 5.801 ms. Best time for 2560K FFT length: 7.328 ms., avg: 7.624 ms. Best time for 3072K FFT length: 8.937 ms., avg: 9.280 ms. Best time for 3584K FFT length: 10.750 ms., avg: 10.768 ms. Best time for 4096K FFT length: 11.897 ms., avg: 12.342 ms. Best time for 5120K FFT length: 15.377 ms., avg: 15.549 ms. Best time for 6144K FFT length: 18.939 ms., avg: 19.378 ms. Best time for 7168K FFT length: 25.291 ms., avg: 26.186 ms. Best time for 8192K FFT length: 25.706 ms., avg: 25.900 ms. Timing FFTs using 4 threads. Best time for 768K FFT length: 1.738 ms., avg: 1.868 ms. Best time for 896K FFT length: 1.986 ms., avg: 2.019 ms. Best time for 1024K FFT length: 2.238 ms., avg: 2.482 ms. Best time for 1280K FFT length: 2.781 ms., avg: 2.986 ms. Best time for 1536K FFT length: 3.345 ms., avg: 3.837 ms. Best time for 1792K FFT length: 4.082 ms., avg: 4.319 ms. Best time for 2048K FFT length: 4.515 ms., avg: 4.792 ms. Best time for 2560K FFT length: 5.774 ms., avg: 6.054 ms. Best time for 3072K FFT length: 6.942 ms., avg: 7.309 ms. Best time for 3584K FFT length: 8.422 ms., avg: 8.582 ms. Best time for 4096K FFT length: 9.295 ms., avg: 9.801 ms. Best time for 5120K FFT length: 11.995 ms., avg: 12.454 ms. Best time for 6144K FFT length: 14.655 ms., avg: 14.902 ms. Best time for 7168K FFT length: 23.160 ms., avg: 23.649 ms. Best time for 8192K FFT length: 19.803 ms., avg: 20.997 ms. Best time for 58 bit trial factors: 1.453 ms. Best time for 59 bit trial factors: 1.504 ms. Best time for 60 bit trial factors: 1.502 ms. Best time for 61 bit trial factors: 1.687 ms. Best time for 62 bit trial factors: 1.675 ms. Best time for 63 bit trial factors: 1.896 ms. Best time for 64 bit trial factors: 1.983 ms. Best time for 65 bit trial factors: 2.307 ms. Best time for 66 bit trial factors: 2.729 ms. Best time for 67 bit trial factors: 2.695 ms. http://valid.canardpc.com/show_oc.php?id=1611553

2011-01-23, 01:14	#536
Commaster Jun 2010 Kiev, Ukraine 39₁₆ Posts	By the way, which is more stable: a higher Base Clock or an insanely huge Multiplier? (Speaking only about the CPU itself)

2011-01-25, 03:07	#539
James Heinrich "James Heinrich" May 2004 ex-Northern Ontario 23×149 Posts	It's now possible to directly compare between CPUs on my throughput calculator. For example, assuming identical clockspeeds, you can see how an i7-2500K neatly outruns an i7-965 by a noticable amount.

2011-08-04, 04:36	#546
ciic May 2011 FR Germany - Berlin 2·7 Posts	New Sandy Bridge PENTIUM G620T 35W TDP Hi ! ------------------------------------------------------------------------------------------------------------------- Here's just some perf data on the new Sandy Bridge Pentium: Intel(R) Pentium(R) CPU G620T @ 2.20GHz 35W TDP (System ~40-45W) Please compare with the specs of an Intel Core i-5 2500K @ 2200 MHz (single thread perf)! Striking!! See: http://mersenne-aries.sili.net/throughput.php?cpu1=Intel%28R%29+Core%28TM%29+i5-2500K+CPU+%40+3.30GHz\|256\|6144&mhz1=2159 __________________________________________________________________ [Thu Aug 4 04:25:30 2011] Compare your results to other computers at http://www.mersenne.org/report_benchmarks Intel(R) Pentium(R) CPU G620T @ 2.20GHz CPU speed: 2160.98 MHz, 2 cores CPU features: Prefetch, MMX, SSE, SSE2, SSE4 L1 cache size: 32 KB L2 cache size: 256 KB, L3 cache size: 3 MB L1 cache line size: 64 bytes L2 cache line size: 64 bytes TLBS: 64 Prime95 64-bit version 26.6, RdtscTiming=1 Best time for 768K FFT length: 12.232 ms., avg: 13.653 ms. Best time for 896K FFT length: 15.825 ms., avg: 18.045 ms. Best time for 1024K FFT length: 17.294 ms., avg: 21.854 ms. Best time for 1280K FFT length: 23.775 ms., avg: 29.384 ms. Best time for 1536K FFT length: 27.425 ms., avg: 28.246 ms. Best time for 1792K FFT length: 33.410 ms., avg: 34.396 ms. Best time for 2048K FFT length: 36.924 ms., avg: 37.782 ms. Best time for 2560K FFT length: 47.147 ms., avg: 51.428 ms. Best time for 3072K FFT length: 57.876 ms., avg: 69.091 ms. Best time for 3584K FFT length: 63.242 ms., avg: 63.406 ms. Best time for 4096K FFT length: 69.737 ms., avg: 70.164 ms. Best time for 5120K FFT length: 90.425 ms., avg: 90.757 ms. Best time for 6144K FFT length: 112.508 ms., avg: 112.865 ms. Best time for 7168K FFT length: 137.033 ms., avg: 137.584 ms. Best time for 8192K FFT length: 149.157 ms., avg: 149.617 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 6.354 ms., avg: 6.505 ms. Best time for 896K FFT length: 7.805 ms., avg: 7.827 ms. Best time for 1024K FFT length: 8.462 ms., avg: 8.571 ms. Best time for 1280K FFT length: 10.826 ms., avg: 10.851 ms. Best time for 1536K FFT length: 12.940 ms., avg: 13.032 ms. Best time for 1792K FFT length: 16.176 ms., avg: 16.751 ms. Best time for 2048K FFT length: 17.773 ms., avg: 18.175 ms. Best time for 2560K FFT length: 22.521 ms., avg: 22.682 ms. Best time for 3072K FFT length: 27.753 ms., avg: 27.791 ms. Best time for 3584K FFT length: 33.201 ms., avg: 33.333 ms. Best time for 4096K FFT length: 36.267 ms., avg: 36.351 ms. Best time for 5120K FFT length: 47.869 ms., avg: 47.995 ms. Best time for 6144K FFT length: 58.741 ms., avg: 58.871 ms. Best time for 7168K FFT length: 78.985 ms., avg: 79.574 ms. Best time for 8192K FFT length: 79.208 ms., avg: 79.566 ms. Best time for 61 bit trial factors: 3.601 ms. Best time for 62 bit trial factors: 3.640 ms. Best time for 63 bit trial factors: 4.084 ms. Best time for 64 bit trial factors: 4.258 ms. Best time for 65 bit trial factors: 4.955 ms. Best time for 66 bit trial factors: 5.825 ms. Best time for 67 bit trial factors: 5.775 ms. Best time for 75 bit trial factors: 5.618 ms. Best time for 76 bit trial factors: 5.610 ms. Best time for 77 bit trial factors: 5.612 ms. Compare your results to other computers at http://www.mersenne.org/report_benchmarks Intel(R) Pentium(R) CPU G620T @ 2.20GHz CPU speed: 2159.88 MHz, 2 cores CPU features: Prefetch, MMX, SSE, SSE2, SSE4 L1 cache size: 32 KB L2 cache size: 256 KB, L3 cache size: 3 MB L1 cache line size: 64 bytes L2 cache line size: 64 bytes TLBS: 64 Prime95 64-bit version 26.6, RdtscTiming=1 Best time for 768K FFT length: 11.917 ms., avg: 11.989 ms. Best time for 896K FFT length: 14.523 ms., avg: 14.609 ms. Best time for 1024K FFT length: 15.931 ms., avg: 16.253 ms. Best time for 1280K FFT length: 20.580 ms., avg: 20.690 ms. Best time for 1536K FFT length: 25.084 ms., avg: 25.369 ms. Best time for 1792K FFT length: 30.315 ms., avg: 30.338 ms. Best time for 2048K FFT length: 33.503 ms., avg: 33.629 ms. Best time for 2560K FFT length: 42.696 ms., avg: 42.854 ms. Best time for 3072K FFT length: 52.339 ms., avg: 63.321 ms. Best time for 3584K FFT length: 63.579 ms., avg: 67.413 ms. Best time for 4096K FFT length: 69.136 ms., avg: 69.679 ms. Best time for 5120K FFT length: 89.757 ms., avg: 90.067 ms. Best time for 6144K FFT length: 111.597 ms., avg: 111.970 ms. Best time for 7168K FFT length: 137.051 ms., avg: 137.556 ms. [Thu Aug 4 04:30:36 2011] Best time for 8192K FFT length: 149.193 ms., avg: 149.655 ms. Timing FFTs using 2 threads. Best time for 768K FFT length: 6.344 ms., avg: 6.413 ms. Best time for 896K FFT length: 7.787 ms., avg: 7.860 ms. Best time for 1024K FFT length: 8.477 ms., avg: 8.534 ms. Best time for 1280K FFT length: 10.806 ms., avg: 10.827 ms. Best time for 1536K FFT length: 13.014 ms., avg: 13.105 ms. Best time for 1792K FFT length: 16.015 ms., avg: 16.087 ms. Best time for 2048K FFT length: 17.940 ms., avg: 17.994 ms. Best time for 2560K FFT length: 22.434 ms., avg: 22.470 ms. Best time for 3072K FFT length: 27.897 ms., avg: 28.022 ms. Best time for 3584K FFT length: 33.418 ms., avg: 33.575 ms. Best time for 4096K FFT length: 36.684 ms., avg: 36.849 ms. Best time for 5120K FFT length: 47.364 ms., avg: 47.534 ms. Best time for 6144K FFT length: 58.353 ms., avg: 58.592 ms. Best time for 7168K FFT length: 78.334 ms., avg: 78.730 ms. Best time for 8192K FFT length: 78.627 ms., avg: 79.162 ms. Best time for 61 bit trial factors: 3.601 ms. Best time for 62 bit trial factors: 3.640 ms. Best time for 63 bit trial factors: 4.085 ms. Best time for 64 bit trial factors: 4.258 ms. Best time for 65 bit trial factors: 4.959 ms. Best time for 66 bit trial factors: 5.823 ms. Best time for 67 bit trial factors: 5.779 ms. Best time for 75 bit trial factors: 5.621 ms. Best time for 76 bit trial factors: 5.613 ms. Best time for 77 bit trial factors: 5.611 ms. [Thu Aug 4 04:34:55 2011]

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