Perpetual benchmark thread... - Page 48

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.

2010-04-12, 02:24	#522
satchvai Apr 2010 2² 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.

2010-04-15, 15:39	#527
satchvai Apr 2010 100₂ 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

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2010-04-12, 17:49	#523
lavalamp Oct 2007 Manchester, UK 5³×11 Posts	That's mighty impressive to be stable at 4.2 GHz on air. What's your setup?