Perpetual benchmark thread... - Page 18

stars10250 · 2008-12-02, 01:19

Sorry about the typo...it's DDR2 as you guessed. I was running my ram at 4-4-4-12 at 400MHz 1:1, but just changed it to 5-5-5-15 at 533MHz, 3:4. I must admit I just figured out how to make this change today! The strapping settings on the motherboard were a bit confusing (I'm a novice recall). Right now it is stress testing but it looks good so far (few hrs in). For fun I started my four LL's and the iteration time dropped from 65 ms to 60 ms across all four cores, which is a nice improvement. Core temps are all 45 degrees C right now during the stress test.

For voltages, I had to crank things up from my earlier ram configuration. The VCore is happy at 1.3125V. Ram voltage is now at 2.1V which is the spec voltage (it didn't like anything less), and the northbridge is at 1.26V. The other voltages are on auto. Before the memory speed change it ran stable at 1.86 V, with the northbridge at 1.24V.

I've tried 3.4 GHz several more times but I can only get it to run stable for about 10 minutes. It didn't feel comfortable so I backed down to 3.2 GHz which it seems to like.

Anyway, I'm happy with my 8% performance improvement for the day :) Anything else I can tweak?

starrynte · 2008-12-02, 01:59

Quote:

Originally Posted by henryzz

would it be too much to ask to have the non-overclocked benchmark in 25.7 or the same overclocked in 24.14 so we can compare the differences easier

(non overclocked 25.7 1 thread has a slight improvement from non overclocked 24.14)
(best benchmark used, these are non-overclocked)

Quote:

Intel(R) Pentium(R) 4 CPU 3.00GHz
CPU speed: 3060.56 MHz
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 16 KB
L2 cache size: 1024 KB
L1 cache line size: 64 bytes
L2 cache line size: 128 bytes
TLBS: 64

Quote:

Best time for 512K FFT length: 17.214 ms.
Best time for 640K FFT length: 22.350 ms.
Best time for 768K FFT length: 27.172 ms.
Best time for 896K FFT length: 33.198 ms.
Best time for 1024K FFT length: 38.122 ms.
Best time for 1280K FFT length: 46.649 ms.
Best time for 1536K FFT length: 56.462 ms.
Best time for 1792K FFT length: 68.155 ms.
Best time for 2048K FFT length: 76.344 ms.
Best time for 2560K FFT length: 100.902 ms.
Best time for 3072K FFT length: 121.601 ms.
Best time for 3584K FFT length: 147.856 ms.
Best time for 4096K FFT length: 163.470 ms.
Best time for 58 bit trial factors: 9.453 ms.
Best time for 59 bit trial factors: 9.536 ms.
Best time for 60 bit trial factors: 9.343 ms.
Best time for 61 bit trial factors: 9.450 ms.
Best time for 62 bit trial factors: 13.165 ms.
Best time for 63 bit trial factors: 13.158 ms.
Best time for 64 bit trial factors: 15.198 ms.
Best time for 65 bit trial factors: 15.172 ms.
Best time for 66 bit trial factors: 15.356 ms.
Best time for 67 bit trial factors: 15.302 ms.

Quote:

Best time for 768K FFT length: 25.056 ms.
Best time for 896K FFT length: 30.631 ms.
Best time for 1024K FFT length: 34.455 ms.
Best time for 1280K FFT length: 42.556 ms.
Best time for 1536K FFT length: 51.596 ms.
Best time for 1792K FFT length: 62.510 ms.
Best time for 2048K FFT length: 69.467 ms.
Best time for 2560K FFT length: 91.631 ms.
Best time for 3072K FFT length: 110.440 ms.
Best time for 3584K FFT length: 133.337 ms.
Best time for 4096K FFT length: 150.112 ms.
Best time for 5120K FFT length: 187.446 ms.
Best time for 6144K FFT length: 237.028 ms.
Best time for 7168K FFT length: 288.179 ms.
Best time for 8192K FFT length: 313.521 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 23.225 ms.
Best time for 896K FFT length: 28.191 ms.
Best time for 1024K FFT length: 30.888 ms.
Best time for 1280K FFT length: 40.017 ms.
Best time for 1536K FFT length: 48.296 ms.
Best time for 1792K FFT length: 58.522 ms.
Best time for 2048K FFT length: 64.314 ms.
Best time for 2560K FFT length: 84.704 ms.
Best time for 3072K FFT length: 103.787 ms.
Best time for 3584K FFT length: 126.496 ms.
Best time for 4096K FFT length: 140.476 ms.
Best time for 5120K FFT length: 183.097 ms.
Best time for 6144K FFT length: 222.241 ms.
Best time for 7168K FFT length: 271.558 ms.
Best time for 8192K FFT length: 297.570 ms.
Best time for 58 bit trial factors: 8.999 ms.
Best time for 59 bit trial factors: 9.073 ms.
Best time for 60 bit trial factors: 9.012 ms.
Best time for 61 bit trial factors: 9.056 ms.
Best time for 62 bit trial factors: 12.610 ms.
Best time for 63 bit trial factors: 12.590 ms.
Best time for 64 bit trial factors: 14.658 ms.
Best time for 65 bit trial factors: 14.912 ms.
Best time for 66 bit trial factors: 14.885 ms.
Best time for 67 bit trial factors: 14.638 ms.

P.S. I was going to put it all in a nice table, but the forum didn't like it lol

lavalamp · 2008-12-02, 02:23

Quote:

Originally Posted by stars10250

Sorry about the typo...it's DDR2 as you guessed. I was running my ram at 4-4-4-12 at 400MHz 1:1, but just changed it to 5-5-5-15 at 533MHz, 3:4. I must admit I just figured out how to make this change today! The strapping settings on the motherboard were a bit confusing (I'm a novice recall). Right now it is stress testing but it looks good so far (few hrs in). For fun I started my four LL's and the iteration time dropped from 65 ms to 60 ms across all four cores, which is a nice improvement. Core temps are all 45 degrees C right now during the stress test.

For voltages, I had to crank things up from my earlier ram configuration. The VCore is happy at 1.3125V. Ram voltage is now at 2.1V which is the spec voltage (it didn't like anything less), and the northbridge is at 1.26V. The other voltages are on auto. Before the memory speed change it ran stable at 1.86 V, with the northbridge at 1.24V.

I've tried 3.4 GHz several more times but I can only get it to run stable for about 10 minutes. It didn't feel comfortable so I backed down to 3.2 GHz which it seems to like.

Anyway, I'm happy with my 8% performance improvement for the day :) Anything else I can tweak?

It looks like there's quite a bit more head room in your system since your temps are low and so is your VCore. You should be fine all the way up to 1.5 V if this thread is correct. Having said that, it would obviously be a bad idea to jump straight there, one should always creep up to these things.

It would probably be a good idea to set yourself a hard limit that you won't pass, like no more than 65 C under load, or 1.45 max VCore.

Depending on how good your CPU cooler and case airflow are, you may want to be more restrictive or more lenient than that though.

stars10250 · 2008-12-02, 12:33

I'm interested in trying for more but here's my concern. Right now it is running 400FSB at 8x for 3.2 GHz. I can't use fractional multipliers, so I have to use 8x or 9x. Also, I'm not sure it would be worth lowering the FSB to say 378 MHz at 9x (to achieve 3.4 GHz), since I think I want to keep the FSB high for good memory speed (though maybe there is a good memory divider for a setting like this?). So I think the only way I can go faster is to go beyond 400 MHz FSB, like 425 MHz. The motherboard is rated for 1600 MHz, so is it ok if I push it to 1700 MHz? I haven't read as much about that. My core temperatures have always been low, partly because I have a big cooler (zerotherm-FZ120) and partly because it is winter time and the room temperatures are low. In the summer this room will be at least 10 degrees F hotter. I've run the Vcore in the 1.4V range before in my attempts at 3.4 GHz, but like I said I was only able to keep it stable for about 10 minutes. Do you have suggestions for 3.3 GHz, 3.4, or other FSB speeds?

James Heinrich · 2008-12-02, 12:36

I just ran a comparison between DDR2@768MHz(5-5-5-15) and DDR3@1536MHz(7-7-7-20) on a Q6600@3.45GHz in this post (see there for analysis). I attach the spreadsheet with the numbers, and post benchmark results in this post.

DDR2@3.50GHz:

Code:

[Wed Nov 26 19:38:31 2008]
#DDR2-768MHz@5-5-5-15
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
CPU speed: 3509.68 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.114 ms.
Best time for 12K FFT length: 0.139 ms.
Best time for 14K FFT length: 0.169 ms.
Best time for 16K FFT length: 0.177 ms.
Best time for 20K FFT length: 0.238 ms.
Best time for 24K FFT length: 0.292 ms.
Best time for 28K FFT length: 0.359 ms.
Best time for 32K FFT length: 0.376 ms.
Best time for 40K FFT length: 0.492 ms.
Best time for 48K FFT length: 0.596 ms.
Best time for 56K FFT length: 0.729 ms.
Best time for 64K FFT length: 0.779 ms.
Best time for 80K FFT length: 1.100 ms.
Best time for 96K FFT length: 1.338 ms.
Best time for 112K FFT length: 1.613 ms.
Best time for 128K FFT length: 1.714 ms.
Best time for 160K FFT length: 2.111 ms.
Best time for 192K FFT length: 2.595 ms.
Best time for 224K FFT length: 3.100 ms.
Best time for 256K FFT length: 3.432 ms.
Best time for 320K FFT length: 4.426 ms.
Best time for 384K FFT length: 5.481 ms.
Best time for 448K FFT length: 6.635 ms.
Best time for 512K FFT length: 7.444 ms.
Best time for 640K FFT length: 9.953 ms.
Best time for 768K FFT length: 12.378 ms.
Best time for 896K FFT length: 14.797 ms.
Best time for 1024K FFT length: 17.033 ms.
Best time for 1280K FFT length: 21.085 ms.
Best time for 1536K FFT length: 25.741 ms.
Best time for 1792K FFT length: 30.855 ms.
Best time for 2048K FFT length: 34.130 ms.
Best time for 2560K FFT length: 45.061 ms.
Best time for 3072K FFT length: 55.006 ms.
Best time for 3584K FFT length: 65.380 ms.
Best time for 4096K FFT length: 73.194 ms.
Best time for 5120K FFT length: 93.600 ms.
Best time for 6144K FFT length: 113.211 ms.
Best time for 7168K FFT length: 137.189 ms.
Best time for 8192K FFT length: 151.017 ms.
Best time for 10240K FFT length: 200.300 ms.
Best time for 12288K FFT length: 241.056 ms.
Best time for 14336K FFT length: 292.154 ms.
Best time for 16384K FFT length: 321.980 ms.
Best time for 20480K FFT length: 444.715 ms.
Best time for 24576K FFT length: 544.538 ms.
Best time for 28672K FFT length: 654.461 ms.
Best time for 32768K FFT length: 719.706 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.081 ms.
Best time for 10K FFT length: 0.093 ms.
Best time for 12K FFT length: 0.098 ms.
Best time for 14K FFT length: 0.110 ms.
Best time for 16K FFT length: 0.120 ms.
Best time for 20K FFT length: 0.146 ms.
Best time for 24K FFT length: 0.174 ms.
Best time for 28K FFT length: 0.210 ms.
Best time for 32K FFT length: 0.220 ms.
Best time for 40K FFT length: 0.617 ms.
Best time for 48K FFT length: 0.635 ms.
Best time for 56K FFT length: 0.717 ms.
Best time for 64K FFT length: 0.733 ms.
Best time for 80K FFT length: 0.666 ms.
Best time for 96K FFT length: 0.782 ms.
Best time for 112K FFT length: 0.927 ms.
Best time for 128K FFT length: 0.984 ms.
Best time for 160K FFT length: 1.173 ms.
Best time for 192K FFT length: 1.370 ms.
Best time for 224K FFT length: 1.623 ms.
Best time for 256K FFT length: 1.797 ms.
Best time for 320K FFT length: 2.302 ms.
Best time for 384K FFT length: 2.857 ms.
Best time for 448K FFT length: 3.479 ms.
Best time for 512K FFT length: 3.923 ms.
Best time for 640K FFT length: 5.440 ms.
Best time for 768K FFT length: 6.804 ms.
Best time for 896K FFT length: 8.146 ms.
Best time for 1024K FFT length: 9.627 ms.
Best time for 1280K FFT length: 11.515 ms.
Best time for 1536K FFT length: 14.154 ms.
Best time for 1792K FFT length: 16.801 ms.
Best time for 2048K FFT length: 18.998 ms.
Best time for 2560K FFT length: 24.881 ms.
Best time for 3072K FFT length: 30.189 ms.
Best time for 3584K FFT length: 35.557 ms.
Best time for 4096K FFT length: 40.470 ms.
Best time for 5120K FFT length: 51.616 ms.
Best time for 6144K FFT length: 63.178 ms.
Best time for 7168K FFT length: 76.763 ms.
Best time for 8192K FFT length: 86.957 ms.
Best time for 10240K FFT length: 107.319 ms.
Best time for 12288K FFT length: 131.929 ms.
Best time for 14336K FFT length: 158.756 ms.
Best time for 16384K FFT length: 180.370 ms.
Best time for 20480K FFT length: 241.373 ms.
Best time for 24576K FFT length: 296.563 ms.
Best time for 28672K FFT length: 358.136 ms.
Best time for 32768K FFT length: 400.957 ms.
Timing FFTs using 3 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.187 ms.
Best time for 12K FFT length: 0.203 ms.
Best time for 14K FFT length: 0.214 ms.
Best time for 16K FFT length: 0.232 ms.
Best time for 20K FFT length: 0.287 ms.
Best time for 24K FFT length: 0.314 ms.
Best time for 28K FFT length: 0.329 ms.
Best time for 32K FFT length: 0.371 ms.
Best time for 40K FFT length: 1.048 ms.
Best time for 48K FFT length: 1.053 ms.
Best time for 56K FFT length: 1.081 ms.
Best time for 64K FFT length: 1.273 ms.
Best time for 80K FFT length: 1.444 ms.
Best time for 96K FFT length: 1.539 ms.
Best time for 112K FFT length: 1.706 ms.
Best time for 128K FFT length: 1.900 ms.
Best time for 160K FFT length: 1.944 ms.
Best time for 192K FFT length: 1.508 ms.
Best time for 224K FFT length: 1.482 ms.
Best time for 256K FFT length: 1.838 ms.
Best time for 320K FFT length: 2.106 ms.
Best time for 384K FFT length: 2.637 ms.
Best time for 448K FFT length: 3.256 ms.
Best time for 512K FFT length: 3.717 ms.
Best time for 640K FFT length: 9.097 ms.
Best time for 768K FFT length: 10.127 ms.
Best time for 896K FFT length: 11.158 ms.
Best time for 1024K FFT length: 17.453 ms.
Best time for 1280K FFT length: 11.153 ms.
Best time for 1536K FFT length: 13.406 ms.
Best time for 1792K FFT length: 15.783 ms.
Best time for 2048K FFT length: 17.994 ms.
Best time for 2560K FFT length: 23.108 ms.
Best time for 3072K FFT length: 28.101 ms.
Best time for 3584K FFT length: 32.790 ms.
Best time for 4096K FFT length: 37.275 ms.
Best time for 5120K FFT length: 45.886 ms.
Best time for 6144K FFT length: 55.636 ms.
Best time for 7168K FFT length: 66.824 ms.
Best time for 8192K FFT length: 75.625 ms.
Best time for 10240K FFT length: 93.922 ms.
Best time for 12288K FFT length: 113.672 ms.
Best time for 14336K FFT length: 136.255 ms.
Best time for 16384K FFT length: 155.163 ms.
Best time for 20480K FFT length: 203.637 ms.
Best time for 24576K FFT length: 251.411 ms.
Best time for 28672K FFT length: 300.996 ms.
Best time for 32768K FFT length: 346.176 ms.
Timing FFTs using 4 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.081 ms.
Best time for 10K FFT length: 0.172 ms.
Best time for 12K FFT length: 0.192 ms.
Best time for 14K FFT length: 0.216 ms.
Best time for 16K FFT length: 0.223 ms.
Best time for 20K FFT length: 0.248 ms.
Best time for 24K FFT length: 0.282 ms.
Best time for 28K FFT length: 0.310 ms.
Best time for 32K FFT length: 0.333 ms.
Best time for 40K FFT length: 0.993 ms.
Best time for 48K FFT length: 1.011 ms.
Best time for 56K FFT length: 1.053 ms.
Best time for 64K FFT length: 1.092 ms.
Best time for 80K FFT length: 1.282 ms.
Best time for 96K FFT length: 1.364 ms.
Best time for 112K FFT length: 1.627 ms.
Best time for 128K FFT length: 1.679 ms.
Best time for 160K FFT length: 1.755 ms.
Best time for 192K FFT length: 1.475 ms.
Best time for 224K FFT length: 1.721 ms.
Best time for 256K FFT length: 1.936 ms.
Best time for 320K FFT length: 2.322 ms.
Best time for 384K FFT length: 2.382 ms.
Best time for 448K FFT length: 2.726 ms.
Best time for 512K FFT length: 3.265 ms.
Best time for 640K FFT length: 7.947 ms.
Best time for 768K FFT length: 9.436 ms.
Best time for 896K FFT length: 10.318 ms.
Best time for 1024K FFT length: 15.066 ms.
Best time for 1280K FFT length: 10.542 ms.
Best time for 1536K FFT length: 11.439 ms.
Best time for 1792K FFT length: 13.442 ms.
Best time for 2048K FFT length: 15.653 ms.
Best time for 2560K FFT length: 19.774 ms.
Best time for 3072K FFT length: 23.986 ms.
Best time for 3584K FFT length: 28.052 ms.
Best time for 4096K FFT length: 32.386 ms.
Best time for 5120K FFT length: 40.127 ms.
Best time for 6144K FFT length: 48.482 ms.
Best time for 7168K FFT length: 57.730 ms.
Best time for 8192K FFT length: 66.891 ms.
Best time for 10240K FFT length: 81.027 ms.
Best time for 12288K FFT length: 97.541 ms.
Best time for 14336K FFT length: 116.472 ms.
Best time for 16384K FFT length: 134.889 ms.
Best time for 20480K FFT length: 174.005 ms.
Best time for 24576K FFT length: 209.800 ms.
Best time for 28672K FFT length: 248.171 ms.
Best time for 32768K FFT length: 293.859 ms.
Best time for 58 bit trial factors: 3.055 ms.
Best time for 59 bit trial factors: 3.055 ms.
Best time for 60 bit trial factors: 3.061 ms.
Best time for 61 bit trial factors: 3.050 ms.
Best time for 62 bit trial factors: 3.057 ms.
Best time for 63 bit trial factors: 5.119 ms.
Best time for 64 bit trial factors: 5.125 ms.
Best time for 65 bit trial factors: 4.753 ms.
Best time for 66 bit trial factors: 4.707 ms.
Best time for 67 bit trial factors: 4.718 ms.

DDR3@3.45GHz:

Code:

[Tue Dec 02 06:40:16 2008]
#DDR3-1536MHz@7-7-7-20
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
CPU speed: 3456.11 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.116 ms.
Best time for 12K FFT length: 0.141 ms.
Best time for 14K FFT length: 0.171 ms.
Best time for 16K FFT length: 0.180 ms.
Best time for 20K FFT length: 0.243 ms.
Best time for 24K FFT length: 0.298 ms.
Best time for 28K FFT length: 0.365 ms.
Best time for 32K FFT length: 0.382 ms.
Best time for 40K FFT length: 0.500 ms.
Best time for 48K FFT length: 0.607 ms.
Best time for 56K FFT length: 0.740 ms.
Best time for 64K FFT length: 0.791 ms.
Best time for 80K FFT length: 1.111 ms.
Best time for 96K FFT length: 1.354 ms.
Best time for 112K FFT length: 1.633 ms.
Best time for 128K FFT length: 1.734 ms.
Best time for 160K FFT length: 2.132 ms.
Best time for 192K FFT length: 2.623 ms.
Best time for 224K FFT length: 3.131 ms.
Best time for 256K FFT length: 3.465 ms.
Best time for 320K FFT length: 4.436 ms.
Best time for 384K FFT length: 5.443 ms.
Best time for 448K FFT length: 6.572 ms.
Best time for 512K FFT length: 7.339 ms.
Best time for 640K FFT length: 9.750 ms.
Best time for 768K FFT length: 12.112 ms.
Best time for 896K FFT length: 14.496 ms.
Best time for 1024K FFT length: 16.510 ms.
Best time for 1280K FFT length: 20.565 ms.
Best time for 1536K FFT length: 25.102 ms.
Best time for 1792K FFT length: 29.824 ms.
Best time for 2048K FFT length: 33.137 ms.
Best time for 2560K FFT length: 43.799 ms.
Best time for 3072K FFT length: 53.392 ms.
Best time for 3584K FFT length: 63.498 ms.
Best time for 4096K FFT length: 70.907 ms.
Best time for 5120K FFT length: 91.239 ms.
Best time for 6144K FFT length: 109.855 ms.
Best time for 7168K FFT length: 133.465 ms.
Best time for 8192K FFT length: 145.937 ms.
Best time for 10240K FFT length: 195.556 ms.
Best time for 12288K FFT length: 235.792 ms.
Best time for 14336K FFT length: 286.173 ms.
Best time for 16384K FFT length: 313.562 ms.
Best time for 20480K FFT length: 434.778 ms.
Best time for 24576K FFT length: 531.574 ms.
Best time for 28672K FFT length: 637.400 ms.
Best time for 32768K FFT length: 698.464 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.087 ms.
Best time for 12K FFT length: 0.100 ms.
Best time for 14K FFT length: 0.112 ms.
Best time for 16K FFT length: 0.121 ms.
Best time for 20K FFT length: 0.150 ms.
Best time for 24K FFT length: 0.176 ms.
Best time for 28K FFT length: 0.213 ms.
Best time for 32K FFT length: 0.223 ms.
Best time for 40K FFT length: 0.629 ms.
Best time for 48K FFT length: 0.645 ms.
Best time for 56K FFT length: 0.727 ms.
Best time for 64K FFT length: 0.742 ms.
Best time for 80K FFT length: 0.719 ms.
Best time for 96K FFT length: 0.801 ms.
Best time for 112K FFT length: 0.937 ms.
Best time for 128K FFT length: 0.993 ms.
Best time for 160K FFT length: 1.187 ms.
Best time for 192K FFT length: 1.391 ms.
Best time for 224K FFT length: 1.653 ms.
Best time for 256K FFT length: 1.830 ms.
Best time for 320K FFT length: 2.331 ms.
Best time for 384K FFT length: 2.867 ms.
Best time for 448K FFT length: 3.459 ms.
Best time for 512K FFT length: 3.868 ms.
Best time for 640K FFT length: 5.319 ms.
Best time for 768K FFT length: 6.504 ms.
Best time for 896K FFT length: 7.756 ms.
Best time for 1024K FFT length: 9.066 ms.
Best time for 1280K FFT length: 10.816 ms.
Best time for 1536K FFT length: 13.217 ms.
Best time for 1792K FFT length: 15.744 ms.
Best time for 2048K FFT length: 17.578 ms.
Best time for 2560K FFT length: 23.146 ms.
Best time for 3072K FFT length: 27.990 ms.
Best time for 3584K FFT length: 33.317 ms.
Best time for 4096K FFT length: 37.714 ms.
Best time for 5120K FFT length: 47.903 ms.
Best time for 6144K FFT length: 58.805 ms.
Best time for 7168K FFT length: 71.386 ms.
Best time for 8192K FFT length: 79.710 ms.
Best time for 10240K FFT length: 102.198 ms.
Best time for 12288K FFT length: 125.097 ms.
Best time for 14336K FFT length: 150.515 ms.
Best time for 16384K FFT length: 169.040 ms.
Best time for 20480K FFT length: 228.052 ms.
Best time for 24576K FFT length: 279.696 ms.
Best time for 28672K FFT length: 335.670 ms.
Best time for 32768K FFT length: 372.478 ms.
Timing FFTs using 3 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.081 ms.
Best time for 8K FFT length: 0.083 ms.
Best time for 10K FFT length: 0.176 ms.
Best time for 12K FFT length: 0.200 ms.
Best time for 14K FFT length: 0.212 ms.
Best time for 16K FFT length: 0.226 ms.
Best time for 20K FFT length: 0.256 ms.
Best time for 24K FFT length: 0.296 ms.
Best time for 28K FFT length: 0.303 ms.
Best time for 32K FFT length: 0.354 ms.
Best time for 40K FFT length: 1.015 ms.
Best time for 48K FFT length: 1.057 ms.
Best time for 56K FFT length: 1.142 ms.
Best time for 64K FFT length: 1.047 ms.
Best time for 80K FFT length: 1.395 ms.
Best time for 96K FFT length: 1.514 ms.
Best time for 112K FFT length: 1.628 ms.
Best time for 128K FFT length: 1.772 ms.
Best time for 160K FFT length: 1.499 ms.
Best time for 192K FFT length: 1.456 ms.
Best time for 224K FFT length: 1.428 ms.
Best time for 256K FFT length: 1.682 ms.
Best time for 320K FFT length: 1.998 ms.
Best time for 384K FFT length: 2.439 ms.
Best time for 448K FFT length: 2.938 ms.
Best time for 512K FFT length: 3.332 ms.
Best time for 640K FFT length: 8.108 ms.
Best time for 768K FFT length: 9.239 ms.
Best time for 896K FFT length: 9.609 ms.
Best time for 1024K FFT length: 15.420 ms.
Best time for 1280K FFT length: 9.200 ms.
Best time for 1536K FFT length: 11.069 ms.
Best time for 1792K FFT length: 13.112 ms.
Best time for 2048K FFT length: 14.746 ms.
Best time for 2560K FFT length: 19.529 ms.
Best time for 3072K FFT length: 23.766 ms.
Best time for 3584K FFT length: 27.594 ms.
Best time for 4096K FFT length: 31.170 ms.
Best time for 5120K FFT length: 38.726 ms.
Best time for 6144K FFT length: 47.268 ms.
Best time for 7168K FFT length: 57.215 ms.
Best time for 8192K FFT length: 63.961 ms.
Best time for 10240K FFT length: 81.300 ms.
Best time for 12288K FFT length: 98.400 ms.
Best time for 14336K FFT length: 119.073 ms.
Best time for 16384K FFT length: 133.521 ms.
Best time for 20480K FFT length: 182.464 ms.
Best time for 24576K FFT length: 224.313 ms.
Best time for 28672K FFT length: 268.433 ms.
Best time for 32768K FFT length: 302.433 ms.
Timing FFTs using 4 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.083 ms.
Best time for 10K FFT length: 0.167 ms.
Best time for 12K FFT length: 0.182 ms.
Best time for 14K FFT length: 0.198 ms.
Best time for 16K FFT length: 0.218 ms.
Best time for 20K FFT length: 0.236 ms.
Best time for 24K FFT length: 0.262 ms.
Best time for 28K FFT length: 0.293 ms.
Best time for 32K FFT length: 0.335 ms.
Best time for 40K FFT length: 0.978 ms.
Best time for 48K FFT length: 0.985 ms.
Best time for 56K FFT length: 1.023 ms.
Best time for 64K FFT length: 1.047 ms.
Best time for 80K FFT length: 1.229 ms.
Best time for 96K FFT length: 1.320 ms.
Best time for 112K FFT length: 1.506 ms.
Best time for 128K FFT length: 1.614 ms.
Best time for 160K FFT length: 1.716 ms.
Best time for 192K FFT length: 1.389 ms.
Best time for 224K FFT length: 1.653 ms.
Best time for 256K FFT length: 1.841 ms.
Best time for 320K FFT length: 1.902 ms.
Best time for 384K FFT length: 2.120 ms.
Best time for 448K FFT length: 2.454 ms.
Best time for 512K FFT length: 2.789 ms.
Best time for 640K FFT length: 7.217 ms.
Best time for 768K FFT length: 8.024 ms.
Best time for 896K FFT length: 9.302 ms.
Best time for 1024K FFT length: 13.678 ms.
Best time for 1280K FFT length: 9.348 ms.
Best time for 1536K FFT length: 9.464 ms.
Best time for 1792K FFT length: 10.641 ms.
Best time for 2048K FFT length: 12.034 ms.
Best time for 2560K FFT length: 15.237 ms.
Best time for 3072K FFT length: 18.569 ms.
Best time for 3584K FFT length: 21.909 ms.
Best time for 4096K FFT length: 24.976 ms.
Best time for 5120K FFT length: 31.124 ms.
Best time for 6144K FFT length: 37.911 ms.
Best time for 7168K FFT length: 45.467 ms.
Best time for 8192K FFT length: 51.748 ms.
Best time for 10240K FFT length: 64.266 ms.
Best time for 12288K FFT length: 77.980 ms.
Best time for 14336K FFT length: 93.578 ms.
Best time for 16384K FFT length: 106.274 ms.
Best time for 20480K FFT length: 142.670 ms.
Best time for 24576K FFT length: 175.327 ms.
Best time for 28672K FFT length: 209.240 ms.
Best time for 32768K FFT length: 236.655 ms.
Best time for 58 bit trial factors: 3.123 ms.
Best time for 59 bit trial factors: 3.128 ms.
Best time for 60 bit trial factors: 3.124 ms.
Best time for 61 bit trial factors: 3.118 ms.
Best time for 62 bit trial factors: 3.085 ms.
Best time for 63 bit trial factors: 5.162 ms.
Best time for 64 bit trial factors: 5.170 ms.
Best time for 65 bit trial factors: 4.793 ms.
Best time for 66 bit trial factors: 4.760 ms.
Best time for 67 bit trial factors: 4.766 ms.

henryzz · 2008-12-02, 13:27

Quote:

Originally Posted by James Heinrich

I just ran a comparison between DDR2@768MHz(5-5-5-15) and DDR3@1536MHz(7-7-7-20) on a Q6600@3.45GHz in this post (see there for analysis). I attach the spreadsheet with the numbers, and post benchmark results in this post.

DDR2@3.50GHz:

Code:

[Wed Nov 26 19:38:31 2008]
#DDR2-768MHz@5-5-5-15
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
CPU speed: 3509.68 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.114 ms.
Best time for 12K FFT length: 0.139 ms.
Best time for 14K FFT length: 0.169 ms.
Best time for 16K FFT length: 0.177 ms.
Best time for 20K FFT length: 0.238 ms.
Best time for 24K FFT length: 0.292 ms.
Best time for 28K FFT length: 0.359 ms.
Best time for 32K FFT length: 0.376 ms.
Best time for 40K FFT length: 0.492 ms.
Best time for 48K FFT length: 0.596 ms.
Best time for 56K FFT length: 0.729 ms.
Best time for 64K FFT length: 0.779 ms.
Best time for 80K FFT length: 1.100 ms.
Best time for 96K FFT length: 1.338 ms.
Best time for 112K FFT length: 1.613 ms.
Best time for 128K FFT length: 1.714 ms.
Best time for 160K FFT length: 2.111 ms.
Best time for 192K FFT length: 2.595 ms.
Best time for 224K FFT length: 3.100 ms.
Best time for 256K FFT length: 3.432 ms.
Best time for 320K FFT length: 4.426 ms.
Best time for 384K FFT length: 5.481 ms.
Best time for 448K FFT length: 6.635 ms.
Best time for 512K FFT length: 7.444 ms.
Best time for 640K FFT length: 9.953 ms.
Best time for 768K FFT length: 12.378 ms.
Best time for 896K FFT length: 14.797 ms.
Best time for 1024K FFT length: 17.033 ms.
Best time for 1280K FFT length: 21.085 ms.
Best time for 1536K FFT length: 25.741 ms.
Best time for 1792K FFT length: 30.855 ms.
Best time for 2048K FFT length: 34.130 ms.
Best time for 2560K FFT length: 45.061 ms.
Best time for 3072K FFT length: 55.006 ms.
Best time for 3584K FFT length: 65.380 ms.
Best time for 4096K FFT length: 73.194 ms.
Best time for 5120K FFT length: 93.600 ms.
Best time for 6144K FFT length: 113.211 ms.
Best time for 7168K FFT length: 137.189 ms.
Best time for 8192K FFT length: 151.017 ms.
Best time for 10240K FFT length: 200.300 ms.
Best time for 12288K FFT length: 241.056 ms.
Best time for 14336K FFT length: 292.154 ms.
Best time for 16384K FFT length: 321.980 ms.
Best time for 20480K FFT length: 444.715 ms.
Best time for 24576K FFT length: 544.538 ms.
Best time for 28672K FFT length: 654.461 ms.
Best time for 32768K FFT length: 719.706 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.081 ms.
Best time for 10K FFT length: 0.093 ms.
Best time for 12K FFT length: 0.098 ms.
Best time for 14K FFT length: 0.110 ms.
Best time for 16K FFT length: 0.120 ms.
Best time for 20K FFT length: 0.146 ms.
Best time for 24K FFT length: 0.174 ms.
Best time for 28K FFT length: 0.210 ms.
Best time for 32K FFT length: 0.220 ms.
Best time for 40K FFT length: 0.617 ms.
Best time for 48K FFT length: 0.635 ms.
Best time for 56K FFT length: 0.717 ms.
Best time for 64K FFT length: 0.733 ms.
Best time for 80K FFT length: 0.666 ms.
Best time for 96K FFT length: 0.782 ms.
Best time for 112K FFT length: 0.927 ms.
Best time for 128K FFT length: 0.984 ms.
Best time for 160K FFT length: 1.173 ms.
Best time for 192K FFT length: 1.370 ms.
Best time for 224K FFT length: 1.623 ms.
Best time for 256K FFT length: 1.797 ms.
Best time for 320K FFT length: 2.302 ms.
Best time for 384K FFT length: 2.857 ms.
Best time for 448K FFT length: 3.479 ms.
Best time for 512K FFT length: 3.923 ms.
Best time for 640K FFT length: 5.440 ms.
Best time for 768K FFT length: 6.804 ms.
Best time for 896K FFT length: 8.146 ms.
Best time for 1024K FFT length: 9.627 ms.
Best time for 1280K FFT length: 11.515 ms.
Best time for 1536K FFT length: 14.154 ms.
Best time for 1792K FFT length: 16.801 ms.
Best time for 2048K FFT length: 18.998 ms.
Best time for 2560K FFT length: 24.881 ms.
Best time for 3072K FFT length: 30.189 ms.
Best time for 3584K FFT length: 35.557 ms.
Best time for 4096K FFT length: 40.470 ms.
Best time for 5120K FFT length: 51.616 ms.
Best time for 6144K FFT length: 63.178 ms.
Best time for 7168K FFT length: 76.763 ms.
Best time for 8192K FFT length: 86.957 ms.
Best time for 10240K FFT length: 107.319 ms.
Best time for 12288K FFT length: 131.929 ms.
Best time for 14336K FFT length: 158.756 ms.
Best time for 16384K FFT length: 180.370 ms.
Best time for 20480K FFT length: 241.373 ms.
Best time for 24576K FFT length: 296.563 ms.
Best time for 28672K FFT length: 358.136 ms.
Best time for 32768K FFT length: 400.957 ms.
Timing FFTs using 3 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.187 ms.
Best time for 12K FFT length: 0.203 ms.
Best time for 14K FFT length: 0.214 ms.
Best time for 16K FFT length: 0.232 ms.
Best time for 20K FFT length: 0.287 ms.
Best time for 24K FFT length: 0.314 ms.
Best time for 28K FFT length: 0.329 ms.
Best time for 32K FFT length: 0.371 ms.
Best time for 40K FFT length: 1.048 ms.
Best time for 48K FFT length: 1.053 ms.
Best time for 56K FFT length: 1.081 ms.
Best time for 64K FFT length: 1.273 ms.
Best time for 80K FFT length: 1.444 ms.
Best time for 96K FFT length: 1.539 ms.
Best time for 112K FFT length: 1.706 ms.
Best time for 128K FFT length: 1.900 ms.
Best time for 160K FFT length: 1.944 ms.
Best time for 192K FFT length: 1.508 ms.
Best time for 224K FFT length: 1.482 ms.
Best time for 256K FFT length: 1.838 ms.
Best time for 320K FFT length: 2.106 ms.
Best time for 384K FFT length: 2.637 ms.
Best time for 448K FFT length: 3.256 ms.
Best time for 512K FFT length: 3.717 ms.
Best time for 640K FFT length: 9.097 ms.
Best time for 768K FFT length: 10.127 ms.
Best time for 896K FFT length: 11.158 ms.
Best time for 1024K FFT length: 17.453 ms.
Best time for 1280K FFT length: 11.153 ms.
Best time for 1536K FFT length: 13.406 ms.
Best time for 1792K FFT length: 15.783 ms.
Best time for 2048K FFT length: 17.994 ms.
Best time for 2560K FFT length: 23.108 ms.
Best time for 3072K FFT length: 28.101 ms.
Best time for 3584K FFT length: 32.790 ms.
Best time for 4096K FFT length: 37.275 ms.
Best time for 5120K FFT length: 45.886 ms.
Best time for 6144K FFT length: 55.636 ms.
Best time for 7168K FFT length: 66.824 ms.
Best time for 8192K FFT length: 75.625 ms.
Best time for 10240K FFT length: 93.922 ms.
Best time for 12288K FFT length: 113.672 ms.
Best time for 14336K FFT length: 136.255 ms.
Best time for 16384K FFT length: 155.163 ms.
Best time for 20480K FFT length: 203.637 ms.
Best time for 24576K FFT length: 251.411 ms.
Best time for 28672K FFT length: 300.996 ms.
Best time for 32768K FFT length: 346.176 ms.
Timing FFTs using 4 threads.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.055 ms.
Best time for 6K FFT length: 0.065 ms.
Best time for 7K FFT length: 0.079 ms.
Best time for 8K FFT length: 0.081 ms.
Best time for 10K FFT length: 0.172 ms.
Best time for 12K FFT length: 0.192 ms.
Best time for 14K FFT length: 0.216 ms.
Best time for 16K FFT length: 0.223 ms.
Best time for 20K FFT length: 0.248 ms.
Best time for 24K FFT length: 0.282 ms.
Best time for 28K FFT length: 0.310 ms.
Best time for 32K FFT length: 0.333 ms.
Best time for 40K FFT length: 0.993 ms.
Best time for 48K FFT length: 1.011 ms.
Best time for 56K FFT length: 1.053 ms.
Best time for 64K FFT length: 1.092 ms.
Best time for 80K FFT length: 1.282 ms.
Best time for 96K FFT length: 1.364 ms.
Best time for 112K FFT length: 1.627 ms.
Best time for 128K FFT length: 1.679 ms.
Best time for 160K FFT length: 1.755 ms.
Best time for 192K FFT length: 1.475 ms.
Best time for 224K FFT length: 1.721 ms.
Best time for 256K FFT length: 1.936 ms.
Best time for 320K FFT length: 2.322 ms.
Best time for 384K FFT length: 2.382 ms.
Best time for 448K FFT length: 2.726 ms.
Best time for 512K FFT length: 3.265 ms.
Best time for 640K FFT length: 7.947 ms.
Best time for 768K FFT length: 9.436 ms.
Best time for 896K FFT length: 10.318 ms.
Best time for 1024K FFT length: 15.066 ms.
Best time for 1280K FFT length: 10.542 ms.
Best time for 1536K FFT length: 11.439 ms.
Best time for 1792K FFT length: 13.442 ms.
Best time for 2048K FFT length: 15.653 ms.
Best time for 2560K FFT length: 19.774 ms.
Best time for 3072K FFT length: 23.986 ms.
Best time for 3584K FFT length: 28.052 ms.
Best time for 4096K FFT length: 32.386 ms.
Best time for 5120K FFT length: 40.127 ms.
Best time for 6144K FFT length: 48.482 ms.
Best time for 7168K FFT length: 57.730 ms.
Best time for 8192K FFT length: 66.891 ms.
Best time for 10240K FFT length: 81.027 ms.
Best time for 12288K FFT length: 97.541 ms.
Best time for 14336K FFT length: 116.472 ms.
Best time for 16384K FFT length: 134.889 ms.
Best time for 20480K FFT length: 174.005 ms.
Best time for 24576K FFT length: 209.800 ms.
Best time for 28672K FFT length: 248.171 ms.
Best time for 32768K FFT length: 293.859 ms.
Best time for 58 bit trial factors: 3.055 ms.
Best time for 59 bit trial factors: 3.055 ms.
Best time for 60 bit trial factors: 3.061 ms.
Best time for 61 bit trial factors: 3.050 ms.
Best time for 62 bit trial factors: 3.057 ms.
Best time for 63 bit trial factors: 5.119 ms.
Best time for 64 bit trial factors: 5.125 ms.
Best time for 65 bit trial factors: 4.753 ms.
Best time for 66 bit trial factors: 4.707 ms.
Best time for 67 bit trial factors: 4.718 ms.

DDR3@3.45GHz:

Code:

[Tue Dec 02 06:40:16 2008]
#DDR3-1536MHz@7-7-7-20
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
CPU speed: 3456.11 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 4 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.116 ms.
Best time for 12K FFT length: 0.141 ms.
Best time for 14K FFT length: 0.171 ms.
Best time for 16K FFT length: 0.180 ms.
Best time for 20K FFT length: 0.243 ms.
Best time for 24K FFT length: 0.298 ms.
Best time for 28K FFT length: 0.365 ms.
Best time for 32K FFT length: 0.382 ms.
Best time for 40K FFT length: 0.500 ms.
Best time for 48K FFT length: 0.607 ms.
Best time for 56K FFT length: 0.740 ms.
Best time for 64K FFT length: 0.791 ms.
Best time for 80K FFT length: 1.111 ms.
Best time for 96K FFT length: 1.354 ms.
Best time for 112K FFT length: 1.633 ms.
Best time for 128K FFT length: 1.734 ms.
Best time for 160K FFT length: 2.132 ms.
Best time for 192K FFT length: 2.623 ms.
Best time for 224K FFT length: 3.131 ms.
Best time for 256K FFT length: 3.465 ms.
Best time for 320K FFT length: 4.436 ms.
Best time for 384K FFT length: 5.443 ms.
Best time for 448K FFT length: 6.572 ms.
Best time for 512K FFT length: 7.339 ms.
Best time for 640K FFT length: 9.750 ms.
Best time for 768K FFT length: 12.112 ms.
Best time for 896K FFT length: 14.496 ms.
Best time for 1024K FFT length: 16.510 ms.
Best time for 1280K FFT length: 20.565 ms.
Best time for 1536K FFT length: 25.102 ms.
Best time for 1792K FFT length: 29.824 ms.
Best time for 2048K FFT length: 33.137 ms.
Best time for 2560K FFT length: 43.799 ms.
Best time for 3072K FFT length: 53.392 ms.
Best time for 3584K FFT length: 63.498 ms.
Best time for 4096K FFT length: 70.907 ms.
Best time for 5120K FFT length: 91.239 ms.
Best time for 6144K FFT length: 109.855 ms.
Best time for 7168K FFT length: 133.465 ms.
Best time for 8192K FFT length: 145.937 ms.
Best time for 10240K FFT length: 195.556 ms.
Best time for 12288K FFT length: 235.792 ms.
Best time for 14336K FFT length: 286.173 ms.
Best time for 16384K FFT length: 313.562 ms.
Best time for 20480K FFT length: 434.778 ms.
Best time for 24576K FFT length: 531.574 ms.
Best time for 28672K FFT length: 637.400 ms.
Best time for 32768K FFT length: 698.464 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.082 ms.
Best time for 10K FFT length: 0.087 ms.
Best time for 12K FFT length: 0.100 ms.
Best time for 14K FFT length: 0.112 ms.
Best time for 16K FFT length: 0.121 ms.
Best time for 20K FFT length: 0.150 ms.
Best time for 24K FFT length: 0.176 ms.
Best time for 28K FFT length: 0.213 ms.
Best time for 32K FFT length: 0.223 ms.
Best time for 40K FFT length: 0.629 ms.
Best time for 48K FFT length: 0.645 ms.
Best time for 56K FFT length: 0.727 ms.
Best time for 64K FFT length: 0.742 ms.
Best time for 80K FFT length: 0.719 ms.
Best time for 96K FFT length: 0.801 ms.
Best time for 112K FFT length: 0.937 ms.
Best time for 128K FFT length: 0.993 ms.
Best time for 160K FFT length: 1.187 ms.
Best time for 192K FFT length: 1.391 ms.
Best time for 224K FFT length: 1.653 ms.
Best time for 256K FFT length: 1.830 ms.
Best time for 320K FFT length: 2.331 ms.
Best time for 384K FFT length: 2.867 ms.
Best time for 448K FFT length: 3.459 ms.
Best time for 512K FFT length: 3.868 ms.
Best time for 640K FFT length: 5.319 ms.
Best time for 768K FFT length: 6.504 ms.
Best time for 896K FFT length: 7.756 ms.
Best time for 1024K FFT length: 9.066 ms.
Best time for 1280K FFT length: 10.816 ms.
Best time for 1536K FFT length: 13.217 ms.
Best time for 1792K FFT length: 15.744 ms.
Best time for 2048K FFT length: 17.578 ms.
Best time for 2560K FFT length: 23.146 ms.
Best time for 3072K FFT length: 27.990 ms.
Best time for 3584K FFT length: 33.317 ms.
Best time for 4096K FFT length: 37.714 ms.
Best time for 5120K FFT length: 47.903 ms.
Best time for 6144K FFT length: 58.805 ms.
Best time for 7168K FFT length: 71.386 ms.
Best time for 8192K FFT length: 79.710 ms.
Best time for 10240K FFT length: 102.198 ms.
Best time for 12288K FFT length: 125.097 ms.
Best time for 14336K FFT length: 150.515 ms.
Best time for 16384K FFT length: 169.040 ms.
Best time for 20480K FFT length: 228.052 ms.
Best time for 24576K FFT length: 279.696 ms.
Best time for 28672K FFT length: 335.670 ms.
Best time for 32768K FFT length: 372.478 ms.
Timing FFTs using 3 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.081 ms.
Best time for 8K FFT length: 0.083 ms.
Best time for 10K FFT length: 0.176 ms.
Best time for 12K FFT length: 0.200 ms.
Best time for 14K FFT length: 0.212 ms.
Best time for 16K FFT length: 0.226 ms.
Best time for 20K FFT length: 0.256 ms.
Best time for 24K FFT length: 0.296 ms.
Best time for 28K FFT length: 0.303 ms.
Best time for 32K FFT length: 0.354 ms.
Best time for 40K FFT length: 1.015 ms.
Best time for 48K FFT length: 1.057 ms.
Best time for 56K FFT length: 1.142 ms.
Best time for 64K FFT length: 1.047 ms.
Best time for 80K FFT length: 1.395 ms.
Best time for 96K FFT length: 1.514 ms.
Best time for 112K FFT length: 1.628 ms.
Best time for 128K FFT length: 1.772 ms.
Best time for 160K FFT length: 1.499 ms.
Best time for 192K FFT length: 1.456 ms.
Best time for 224K FFT length: 1.428 ms.
Best time for 256K FFT length: 1.682 ms.
Best time for 320K FFT length: 1.998 ms.
Best time for 384K FFT length: 2.439 ms.
Best time for 448K FFT length: 2.938 ms.
Best time for 512K FFT length: 3.332 ms.
Best time for 640K FFT length: 8.108 ms.
Best time for 768K FFT length: 9.239 ms.
Best time for 896K FFT length: 9.609 ms.
Best time for 1024K FFT length: 15.420 ms.
Best time for 1280K FFT length: 9.200 ms.
Best time for 1536K FFT length: 11.069 ms.
Best time for 1792K FFT length: 13.112 ms.
Best time for 2048K FFT length: 14.746 ms.
Best time for 2560K FFT length: 19.529 ms.
Best time for 3072K FFT length: 23.766 ms.
Best time for 3584K FFT length: 27.594 ms.
Best time for 4096K FFT length: 31.170 ms.
Best time for 5120K FFT length: 38.726 ms.
Best time for 6144K FFT length: 47.268 ms.
Best time for 7168K FFT length: 57.215 ms.
Best time for 8192K FFT length: 63.961 ms.
Best time for 10240K FFT length: 81.300 ms.
Best time for 12288K FFT length: 98.400 ms.
Best time for 14336K FFT length: 119.073 ms.
Best time for 16384K FFT length: 133.521 ms.
Best time for 20480K FFT length: 182.464 ms.
Best time for 24576K FFT length: 224.313 ms.
Best time for 28672K FFT length: 268.433 ms.
Best time for 32768K FFT length: 302.433 ms.
Timing FFTs using 4 threads.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.056 ms.
Best time for 6K FFT length: 0.066 ms.
Best time for 7K FFT length: 0.080 ms.
Best time for 8K FFT length: 0.083 ms.
Best time for 10K FFT length: 0.167 ms.
Best time for 12K FFT length: 0.182 ms.
Best time for 14K FFT length: 0.198 ms.
Best time for 16K FFT length: 0.218 ms.
Best time for 20K FFT length: 0.236 ms.
Best time for 24K FFT length: 0.262 ms.
Best time for 28K FFT length: 0.293 ms.
Best time for 32K FFT length: 0.335 ms.
Best time for 40K FFT length: 0.978 ms.
Best time for 48K FFT length: 0.985 ms.
Best time for 56K FFT length: 1.023 ms.
Best time for 64K FFT length: 1.047 ms.
Best time for 80K FFT length: 1.229 ms.
Best time for 96K FFT length: 1.320 ms.
Best time for 112K FFT length: 1.506 ms.
Best time for 128K FFT length: 1.614 ms.
Best time for 160K FFT length: 1.716 ms.
Best time for 192K FFT length: 1.389 ms.
Best time for 224K FFT length: 1.653 ms.
Best time for 256K FFT length: 1.841 ms.
Best time for 320K FFT length: 1.902 ms.
Best time for 384K FFT length: 2.120 ms.
Best time for 448K FFT length: 2.454 ms.
Best time for 512K FFT length: 2.789 ms.
Best time for 640K FFT length: 7.217 ms.
Best time for 768K FFT length: 8.024 ms.
Best time for 896K FFT length: 9.302 ms.
Best time for 1024K FFT length: 13.678 ms.
Best time for 1280K FFT length: 9.348 ms.
Best time for 1536K FFT length: 9.464 ms.
Best time for 1792K FFT length: 10.641 ms.
Best time for 2048K FFT length: 12.034 ms.
Best time for 2560K FFT length: 15.237 ms.
Best time for 3072K FFT length: 18.569 ms.
Best time for 3584K FFT length: 21.909 ms.
Best time for 4096K FFT length: 24.976 ms.
Best time for 5120K FFT length: 31.124 ms.
Best time for 6144K FFT length: 37.911 ms.
Best time for 7168K FFT length: 45.467 ms.
Best time for 8192K FFT length: 51.748 ms.
Best time for 10240K FFT length: 64.266 ms.
Best time for 12288K FFT length: 77.980 ms.
Best time for 14336K FFT length: 93.578 ms.
Best time for 16384K FFT length: 106.274 ms.
Best time for 20480K FFT length: 142.670 ms.
Best time for 24576K FFT length: 175.327 ms.
Best time for 28672K FFT length: 209.240 ms.
Best time for 32768K FFT length: 236.655 ms.
Best time for 58 bit trial factors: 3.123 ms.
Best time for 59 bit trial factors: 3.128 ms.
Best time for 60 bit trial factors: 3.124 ms.
Best time for 61 bit trial factors: 3.118 ms.
Best time for 62 bit trial factors: 3.085 ms.
Best time for 63 bit trial factors: 5.162 ms.
Best time for 64 bit trial factors: 5.170 ms.
Best time for 65 bit trial factors: 4.793 ms.
Best time for 66 bit trial factors: 4.760 ms.
Best time for 67 bit trial factors: 4.766 ms.

since you are underclocking both lots of memory would either of them cope with tighter timings

lavalamp · 2008-12-02, 20:07

Quote:

Originally Posted by stars10250

I'm interested in trying for more but here's my concern. Right now it is running 400FSB at 8x for 3.2 GHz. I can't use fractional multipliers, so I have to use 8x or 9x. Also, I'm not sure it would be worth lowering the FSB to say 378 MHz at 9x (to achieve 3.4 GHz), since I think I want to keep the FSB high for good memory speed (though maybe there is a good memory divider for a setting like this?). So I think the only way I can go faster is to go beyond 400 MHz FSB, like 425 MHz. The motherboard is rated for 1600 MHz, so is it ok if I push it to 1700 MHz? I haven't read as much about that. My core temperatures have always been low, partly because I have a big cooler (zerotherm-FZ120) and partly because it is winter time and the room temperatures are low. In the summer this room will be at least 10 degrees F hotter. I've run the Vcore in the 1.4V range before in my attempts at 3.4 GHz, but like I said I was only able to keep it stable for about 10 minutes. Do you have suggestions for 3.3 GHz, 3.4, or other FSB speeds?

Use the memory divider to run the RAM pretty slow, then try overclocking your CPU further. It may be that you hit the max speed for your RAM and that was holding you back with your CPU.

Once you get a nice CPU overclock, you can bring the RAM back up to speed.

James Heinrich · 2008-12-02, 23:55

Quote:

Originally Posted by henryzz

since you are underclocking both lots of memory would either of them cope with tighter timings

But not my memory, unfortunately. My PC2-6400 is actually rated 4-4-4-15, and I can do that with 2 sticks but not 4 sticks (well, not well enough to be Prime-stable).
The PC3-12800 is rated at 7-7-7-20... you'll be hard-pressed to find any DDR3 that runs much tighter timings than that. And remember, I'm only underclocking the RAM by 4%

lavalamp · 2008-12-03, 02:01

Quote:

Originally Posted by James Heinrich

But not my memory, unfortunately. My PC2-6400 is actually rated 4-4-4-15, and I can do that with 2 sticks but not 4 sticks (well, not well enough to be Prime-stable).

Hm, that's odd. Is it the voltage sagging? If so adding a little more VDIMM might fix it.

db597 · 2008-12-03, 04:00

Quote:

Originally Posted by stars10250

I'm interested in trying for more but here's my concern. Right now it is running 400FSB at 8x for 3.2 GHz. I can't use fractional multipliers, so I have to use 8x or 9x. Also, I'm not sure it would be worth lowering the FSB to say 378 MHz at 9x (to achieve 3.4 GHz), since I think I want to keep the FSB high for good memory speed (though maybe there is a good memory divider for a setting like this?). So I think the only way I can go faster is to go beyond 400 MHz FSB, like 425 MHz. The motherboard is rated for 1600 MHz, so is it ok if I push it to 1700 MHz? I haven't read as much about that. My core temperatures have always been low, partly because I have a big cooler (zerotherm-FZ120) and partly because it is winter time and the room temperatures are low. In the summer this room will be at least 10 degrees F hotter. I've run the Vcore in the 1.4V range before in my attempts at 3.4 GHz, but like I said I was only able to keep it stable for about 10 minutes. Do you have suggestions for 3.3 GHz, 3.4, or other FSB speeds?

From my testing, the Q6600 doesn't support half multipliers. I tried swapping it with a E5200 and in the BIOS a new line appeared to do those 0.5x settings. So it's clearly not the board but dependant on the CPU.

The bottleneck here is the memory and not the FSB. I found very little improvement in raising it further - IMHO not worth the trouble. With your current settings, I think you're already at the max of what your hardware should be doing in terms of durability at running Prime95.

Given the bottleneck, you might want to consider using the 4th core to run something else rather than LL testing. In my case, I use it to feed the GPU client for folding@home. But you could also do TF or some other prime related project.

James Heinrich · 2008-12-03, 10:54

Quote:

Originally Posted by lavalamp

Hm, that's odd. Is it the voltage sagging? If so adding a little more VDIMM might fix it.

I'm running them at 2.10V, which sags to between 2.06V and 2.10V. I can bump that to 2.20V, but then my RAM runs hotter than I am comfortable with. I'm content, as a balance between everything, of sticking where I am.

James Heinrich · 2008-12-04, 01:47

Benchmarks for an i7 965, all run on Vista64.

v25.7.3 32-bit:

Code:

Compare your results to other computers at http://www.mersenne.org/bench.htm
Intel(R) Core(TM) i7 CPU         965  @ 3.20GHz
CPU speed: 3213.29 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8064 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.7, RdtscTiming=1
Best time for 768K FFT length: 11.785 ms.
Best time for 896K FFT length: 14.100 ms.
Best time for 1024K FFT length: 16.264 ms.
Best time for 1280K FFT length: 21.274 ms.
Best time for 1536K FFT length: 26.045 ms.
Best time for 1792K FFT length: 31.026 ms.
Best time for 2048K FFT length: 34.818 ms.
Best time for 2560K FFT length: 43.932 ms.
Best time for 3072K FFT length: 53.583 ms.
Best time for 3584K FFT length: 63.882 ms.
Best time for 4096K FFT length: 72.357 ms.
Best time for 5120K FFT length: 92.086 ms.
Best time for 6144K FFT length: 110.718 ms.
Best time for 7168K FFT length: 132.313 ms.
Best time for 8192K FFT length: 149.259 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 6.173 ms.
Best time for 896K FFT length: 7.357 ms.
Best time for 1024K FFT length: 8.762 ms.
Best time for 1280K FFT length: 10.900 ms.
Best time for 1536K FFT length: 13.302 ms.
Best time for 1792K FFT length: 15.655 ms.
Best time for 2048K FFT length: 17.549 ms.
Best time for 2560K FFT length: 22.771 ms.
Best time for 3072K FFT length: 27.720 ms.
Best time for 3584K FFT length: 32.996 ms.
Best time for 4096K FFT length: 37.343 ms.
Best time for 5120K FFT length: 47.381 ms.
Best time for 6144K FFT length: 56.771 ms.
Best time for 7168K FFT length: 67.996 ms.
Best time for 8192K FFT length: 76.719 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 6.502 ms.
Best time for 896K FFT length: 7.806 ms.
Best time for 1024K FFT length: 10.243 ms.
Best time for 1280K FFT length: 10.149 ms.
Best time for 1536K FFT length: 12.292 ms.
Best time for 1792K FFT length: 14.477 ms.
Best time for 2048K FFT length: 16.213 ms.
Best time for 2560K FFT length: 20.925 ms.
Best time for 3072K FFT length: 25.546 ms.
Best time for 3584K FFT length: 30.504 ms.
Best time for 4096K FFT length: 34.164 ms.
Best time for 5120K FFT length: 43.709 ms.
Best time for 6144K FFT length: 52.317 ms.
Best time for 7168K FFT length: 62.837 ms.
Best time for 8192K FFT length: 69.712 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 4.868 ms.
Best time for 896K FFT length: 5.521 ms.
Best time for 1024K FFT length: 7.638 ms.
Best time for 1280K FFT length: 6.855 ms.
Best time for 1536K FFT length: 8.297 ms.
Best time for 1792K FFT length: 9.594 ms.
Best time for 2048K FFT length: 10.757 ms.
Best time for 2560K FFT length: 13.729 ms.
Best time for 3072K FFT length: 16.559 ms.
Best time for 3584K FFT length: 19.734 ms.
Best time for 4096K FFT length: 21.589 ms.
Best time for 5120K FFT length: 27.900 ms.
Best time for 6144K FFT length: 34.830 ms.
Best time for 7168K FFT length: 41.501 ms.
Best time for 8192K FFT length: 47.446 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 4.963 ms.
Best time for 896K FFT length: 5.647 ms.
Best time for 1024K FFT length: 7.855 ms.
Best time for 1280K FFT length: 7.008 ms.
Best time for 1536K FFT length: 8.410 ms.
Best time for 1792K FFT length: 9.755 ms.
Best time for 2048K FFT length: 11.334 ms.
Best time for 2560K FFT length: 13.995 ms.
Best time for 3072K FFT length: 16.680 ms.
Best time for 3584K FFT length: 19.255 ms.
Best time for 4096K FFT length: 21.736 ms.
Best time for 5120K FFT length: 27.403 ms.
Best time for 6144K FFT length: 33.567 ms.
Best time for 7168K FFT length: 40.368 ms.
Best time for 8192K FFT length: 46.842 ms.
Best time for 58 bit trial factors: 2.924 ms.
Best time for 59 bit trial factors: 2.925 ms.
Best time for 60 bit trial factors: 2.913 ms.
Best time for 61 bit trial factors: 2.923 ms.
Best time for 62 bit trial factors: 4.895 ms.
Best time for 63 bit trial factors: 4.914 ms.
Best time for 64 bit trial factors: 4.497 ms.
Best time for 65 bit trial factors: 4.463 ms.
Best time for 66 bit trial factors: 4.465 ms.
Best time for 67 bit trial factors: 4.444 ms.

v25.8.1 32-bit:

Code:

Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU         965  @ 3.20GHz
CPU speed: 3213.34 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8064 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 768K FFT length: 11.736 ms.
Best time for 896K FFT length: 14.045 ms.
Best time for 1024K FFT length: 16.289 ms.
Best time for 1280K FFT length: 21.267 ms.
Best time for 1536K FFT length: 26.015 ms.
Best time for 1792K FFT length: 31.002 ms.
Best time for 2048K FFT length: 34.696 ms.
Best time for 2560K FFT length: 43.829 ms.
Best time for 3072K FFT length: 53.565 ms.
Best time for 3584K FFT length: 63.900 ms.
Best time for 4096K FFT length: 72.327 ms.
Best time for 5120K FFT length: 92.061 ms.
Best time for 6144K FFT length: 110.674 ms.
Best time for 7168K FFT length: 132.316 ms.
Best time for 8192K FFT length: 149.120 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 11.254 ms.
Best time for 896K FFT length: 13.404 ms.
Best time for 1024K FFT length: 15.351 ms.
Best time for 1280K FFT length: 19.158 ms.
Best time for 1536K FFT length: 23.279 ms.
Best time for 1792K FFT length: 27.728 ms.
Best time for 2048K FFT length: 30.880 ms.
Best time for 2560K FFT length: 40.776 ms.
Best time for 3072K FFT length: 49.750 ms.
Best time for 3584K FFT length: 59.667 ms.
Best time for 4096K FFT length: 66.452 ms.
Best time for 5120K FFT length: 85.335 ms.
Best time for 6144K FFT length: 102.419 ms.
Best time for 7168K FFT length: 122.151 ms.
Best time for 8192K FFT length: 136.211 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 6.827 ms.
Best time for 896K FFT length: 7.858 ms.
Best time for 1024K FFT length: 10.246 ms.
Best time for 1280K FFT length: 10.130 ms.
Best time for 1536K FFT length: 12.299 ms.
Best time for 1792K FFT length: 14.468 ms.
Best time for 2048K FFT length: 16.189 ms.
Best time for 2560K FFT length: 20.968 ms.
Best time for 3072K FFT length: 25.479 ms.
Best time for 3584K FFT length: 30.657 ms.
Best time for 4096K FFT length: 34.221 ms.
Best time for 5120K FFT length: 43.689 ms.
Best time for 6144K FFT length: 52.536 ms.
Best time for 7168K FFT length: 62.867 ms.
Best time for 8192K FFT length: 70.123 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 5.818 ms.
Best time for 896K FFT length: 6.702 ms.
Best time for 1024K FFT length: 8.989 ms.
Best time for 1280K FFT length: 7.944 ms.
Best time for 1536K FFT length: 9.464 ms.
Best time for 1792K FFT length: 10.912 ms.
Best time for 2048K FFT length: 12.330 ms.
Best time for 2560K FFT length: 15.073 ms.
Best time for 3072K FFT length: 18.048 ms.
Best time for 3584K FFT length: 21.241 ms.
Best time for 4096K FFT length: 23.962 ms.
Best time for 5120K FFT length: 30.495 ms.
Best time for 6144K FFT length: 38.042 ms.
Best time for 7168K FFT length: 45.712 ms.
Best time for 8192K FFT length: 51.965 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 5.382 ms.
Best time for 896K FFT length: 6.121 ms.
Best time for 1024K FFT length: 8.324 ms.
Best time for 1280K FFT length: 7.224 ms.
Best time for 1536K FFT length: 8.640 ms.
Best time for 1792K FFT length: 9.865 ms.
Best time for 2048K FFT length: 11.181 ms.
Best time for 2560K FFT length: 13.660 ms.
Best time for 3072K FFT length: 16.476 ms.
Best time for 3584K FFT length: 19.046 ms.
Best time for 4096K FFT length: 21.734 ms.
Best time for 5120K FFT length: 26.722 ms.
Best time for 6144K FFT length: 33.991 ms.
Best time for 7168K FFT length: 41.262 ms.
Best time for 8192K FFT length: 47.521 ms.
Best time for 58 bit trial factors: 2.920 ms.
Best time for 59 bit trial factors: 2.924 ms.
Best time for 60 bit trial factors: 2.925 ms.
Best time for 61 bit trial factors: 2.913 ms.
Best time for 62 bit trial factors: 2.923 ms.
Best time for 63 bit trial factors: 4.911 ms.
Best time for 64 bit trial factors: 5.107 ms.
Best time for 65 bit trial factors: 4.497 ms.
Best time for 66 bit trial factors: 4.478 ms.
Best time for 67 bit trial factors: 4.468 ms.

v25.8.1 32-bit (fullbench):

Code:

Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU         965  @ 3.20GHz
CPU speed: 3213.20 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8064 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 4K FFT length: 0.077 ms.
Best time for 5K FFT length: 0.105 ms.
Best time for 6K FFT length: 0.060 ms.
Best time for 7K FFT length: 0.075 ms.
Best time for 8K FFT length: 0.078 ms.
Best time for 10K FFT length: 0.111 ms.
Best time for 12K FFT length: 0.134 ms.
Best time for 14K FFT length: 0.162 ms.
Best time for 16K FFT length: 0.179 ms.
Best time for 20K FFT length: 0.229 ms.
Best time for 24K FFT length: 0.279 ms.
Best time for 28K FFT length: 0.342 ms.
Best time for 32K FFT length: 0.376 ms.
Best time for 40K FFT length: 0.503 ms.
Best time for 48K FFT length: 0.609 ms.
Best time for 56K FFT length: 0.732 ms.
Best time for 64K FFT length: 0.812 ms.
Best time for 80K FFT length: 1.071 ms.
Best time for 96K FFT length: 1.302 ms.
Best time for 112K FFT length: 1.557 ms.
Best time for 128K FFT length: 1.742 ms.
Best time for 160K FFT length: 2.199 ms.
Best time for 192K FFT length: 2.676 ms.
Best time for 224K FFT length: 3.177 ms.
Best time for 256K FFT length: 3.578 ms.
Best time for 320K FFT length: 4.508 ms.
Best time for 384K FFT length: 5.507 ms.
Best time for 448K FFT length: 6.565 ms.
Best time for 512K FFT length: 7.408 ms.
Best time for 640K FFT length: 9.602 ms.
Best time for 768K FFT length: 11.736 ms.
Best time for 896K FFT length: 14.040 ms.
Best time for 1024K FFT length: 16.239 ms.
Best time for 1280K FFT length: 21.263 ms.
Best time for 1536K FFT length: 25.974 ms.
Best time for 1792K FFT length: 31.014 ms.
Best time for 2048K FFT length: 34.625 ms.
Best time for 2560K FFT length: 43.844 ms.
Best time for 3072K FFT length: 53.579 ms.
Best time for 3584K FFT length: 63.914 ms.
Best time for 4096K FFT length: 72.305 ms.
Best time for 5120K FFT length: 92.041 ms.
Best time for 6144K FFT length: 110.627 ms.
Best time for 7168K FFT length: 132.381 ms.
Best time for 8192K FFT length: 149.110 ms.
Best time for 10240K FFT length: 200.748 ms.
Best time for 12288K FFT length: 240.782 ms.
Best time for 14336K FFT length: 287.422 ms.
Best time for 16384K FFT length: 325.059 ms.
Best time for 20480K FFT length: 453.521 ms.
Best time for 24576K FFT length: 551.030 ms.
Best time for 28672K FFT length: 659.113 ms.
Best time for 32768K FFT length: 744.088 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.050 ms.
Best time for 6K FFT length: 0.060 ms.
Best time for 7K FFT length: 0.075 ms.
Best time for 8K FFT length: 0.078 ms.
Best time for 10K FFT length: 0.139 ms.
Best time for 12K FFT length: 0.167 ms.
Best time for 14K FFT length: 0.182 ms.
Best time for 16K FFT length: 0.198 ms.
Best time for 20K FFT length: 0.239 ms.
Best time for 24K FFT length: 0.287 ms.
Best time for 28K FFT length: 0.343 ms.
Best time for 32K FFT length: 0.374 ms.
Best time for 40K FFT length: 0.812 ms.
Best time for 48K FFT length: 0.886 ms.
Best time for 56K FFT length: 0.992 ms.
Best time for 64K FFT length: 1.066 ms.
Best time for 80K FFT length: 1.251 ms.
Best time for 96K FFT length: 1.352 ms.
Best time for 112K FFT length: 1.538 ms.
Best time for 128K FFT length: 1.690 ms.
Best time for 160K FFT length: 2.127 ms.
Best time for 192K FFT length: 2.531 ms.
Best time for 224K FFT length: 3.027 ms.
Best time for 256K FFT length: 3.372 ms.
Best time for 320K FFT length: 4.287 ms.
Best time for 384K FFT length: 5.246 ms.
Best time for 448K FFT length: 6.268 ms.
Best time for 512K FFT length: 6.992 ms.
Best time for 640K FFT length: 9.214 ms.
Best time for 768K FFT length: 11.238 ms.
Best time for 896K FFT length: 13.460 ms.
Best time for 1024K FFT length: 15.361 ms.
Best time for 1280K FFT length: 19.101 ms.
Best time for 1536K FFT length: 23.245 ms.
Best time for 1792K FFT length: 27.723 ms.
Best time for 2048K FFT length: 30.878 ms.
Best time for 2560K FFT length: 40.784 ms.
Best time for 3072K FFT length: 49.683 ms.
Best time for 3584K FFT length: 59.719 ms.
Best time for 4096K FFT length: 66.475 ms.
Best time for 5120K FFT length: 85.313 ms.
Best time for 6144K FFT length: 102.299 ms.
Best time for 7168K FFT length: 122.476 ms.
Best time for 8192K FFT length: 135.817 ms.
Best time for 10240K FFT length: 183.648 ms.
Best time for 12288K FFT length: 219.346 ms.
Best time for 14336K FFT length: 263.021 ms.
Best time for 16384K FFT length: 292.275 ms.
Best time for 20480K FFT length: 402.851 ms.
Best time for 24576K FFT length: 488.899 ms.
Best time for 28672K FFT length: 581.569 ms.
Best time for 32768K FFT length: 651.345 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.051 ms.
Best time for 6K FFT length: 0.060 ms.
Best time for 7K FFT length: 0.075 ms.
Best time for 8K FFT length: 0.078 ms.
Best time for 10K FFT length: 0.118 ms.
Best time for 12K FFT length: 0.138 ms.
Best time for 14K FFT length: 0.155 ms.
Best time for 16K FFT length: 0.167 ms.
Best time for 20K FFT length: 0.190 ms.
Best time for 24K FFT length: 0.213 ms.
Best time for 28K FFT length: 0.232 ms.
Best time for 32K FFT length: 0.255 ms.
Best time for 40K FFT length: 0.691 ms.
Best time for 48K FFT length: 0.724 ms.
Best time for 56K FFT length: 0.800 ms.
Best time for 64K FFT length: 0.826 ms.
Best time for 80K FFT length: 0.940 ms.
Best time for 96K FFT length: 1.060 ms.
Best time for 112K FFT length: 1.220 ms.
Best time for 128K FFT length: 1.315 ms.
Best time for 160K FFT length: 1.417 ms.
Best time for 192K FFT length: 1.435 ms.
Best time for 224K FFT length: 1.649 ms.
Best time for 256K FFT length: 1.843 ms.
Best time for 320K FFT length: 2.289 ms.
Best time for 384K FFT length: 2.783 ms.
Best time for 448K FFT length: 3.278 ms.
Best time for 512K FFT length: 3.679 ms.
Best time for 640K FFT length: 5.934 ms.
Best time for 768K FFT length: 6.826 ms.
Best time for 896K FFT length: 7.835 ms.
Best time for 1024K FFT length: 10.257 ms.
Best time for 1280K FFT length: 10.139 ms.
Best time for 1536K FFT length: 12.289 ms.
Best time for 1792K FFT length: 14.424 ms.
Best time for 2048K FFT length: 16.188 ms.
Best time for 2560K FFT length: 20.914 ms.
Best time for 3072K FFT length: 25.527 ms.
Best time for 3584K FFT length: 30.691 ms.
Best time for 4096K FFT length: 34.371 ms.
Best time for 5120K FFT length: 43.729 ms.
Best time for 6144K FFT length: 52.596 ms.
Best time for 7168K FFT length: 62.852 ms.
Best time for 8192K FFT length: 70.152 ms.
Best time for 10240K FFT length: 93.745 ms.
Best time for 12288K FFT length: 112.528 ms.
Best time for 14336K FFT length: 134.585 ms.
Best time for 16384K FFT length: 150.329 ms.
Best time for 20480K FFT length: 204.302 ms.
Best time for 24576K FFT length: 247.738 ms.
Best time for 28672K FFT length: 294.419 ms.
Best time for 32768K FFT length: 330.132 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 4K FFT length: 0.038 ms.
Best time for 5K FFT length: 0.051 ms.
Best time for 6K FFT length: 0.060 ms.
Best time for 7K FFT length: 0.076 ms.
Best time for 8K FFT length: 0.078 ms.
Best time for 10K FFT length: 0.117 ms.
Best time for 12K FFT length: 0.128 ms.
Best time for 14K FFT length: 0.143 ms.
Best time for 16K FFT length: 0.151 ms.
Best time for 20K FFT length: 0.177 ms.
Best time for 24K FFT length: 0.195 ms.
Best time for 28K FFT length: 0.216 ms.
Best time for 32K FFT length: 0.235 ms.
Best time for 40K FFT length: 0.667 ms.
Best time for 48K FFT length: 0.728 ms.
Best time for 56K FFT length: 0.751 ms.
Best time for 64K FFT length: 0.781 ms.
Best time for 80K FFT length: 0.877 ms.
Best time for 96K FFT length: 0.949 ms.
Best time for 112K FFT length: 1.101 ms.
Best time for 128K FFT length: 1.184 ms.
Best time for 160K FFT length: 1.255 ms.
Best time for 192K FFT length: 1.220 ms.
Best time for 224K FFT length: 1.384 ms.
Best time for 256K FFT length: 1.556 ms.
Best time for 320K FFT length: 1.862 ms.
Best time for 384K FFT length: 2.223 ms.
Best time for 448K FFT length: 2.531 ms.
Best time for 512K FFT length: 2.891 ms.
Best time for 640K FFT length: 5.175 ms.
Best time for 768K FFT length: 5.832 ms.
Best time for 896K FFT length: 6.719 ms.
Best time for 1024K FFT length: 9.014 ms.
Best time for 1280K FFT length: 7.940 ms.
Best time for 1536K FFT length: 9.471 ms.
Best time for 1792K FFT length: 10.887 ms.
Best time for 2048K FFT length: 12.320 ms.
Best time for 2560K FFT length: 15.015 ms.
Best time for 3072K FFT length: 18.034 ms.
Best time for 3584K FFT length: 21.236 ms.
Best time for 4096K FFT length: 23.962 ms.
Best time for 5120K FFT length: 30.466 ms.
Best time for 6144K FFT length: 38.009 ms.
Best time for 7168K FFT length: 45.768 ms.
Best time for 8192K FFT length: 52.019 ms.
Best time for 10240K FFT length: 66.106 ms.
Best time for 12288K FFT length: 82.306 ms.
Best time for 14336K FFT length: 98.799 ms.
Best time for 16384K FFT length: 112.390 ms.
Best time for 20480K FFT length: 142.996 ms.
Best time for 24576K FFT length: 173.497 ms.
Best time for 28672K FFT length: 205.701 ms.
Best time for 32768K FFT length: 232.499 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 4K FFT length: 0.037 ms.
Best time for 5K FFT length: 0.051 ms.
Best time for 6K FFT length: 0.060 ms.
Best time for 7K FFT length: 0.075 ms.
Best time for 8K FFT length: 0.078 ms.
Best time for 10K FFT length: 0.114 ms.
Best time for 12K FFT length: 0.122 ms.
Best time for 14K FFT length: 0.136 ms.
Best time for 16K FFT length: 0.145 ms.
Best time for 20K FFT length: 0.167 ms.
Best time for 24K FFT length: 0.184 ms.
Best time for 28K FFT length: 0.202 ms.
Best time for 32K FFT length: 0.218 ms.
Best time for 40K FFT length: 0.656 ms.
Best time for 48K FFT length: 0.674 ms.
Best time for 56K FFT length: 0.741 ms.
Best time for 64K FFT length: 0.762 ms.
Best time for 80K FFT length: 0.824 ms.
Best time for 96K FFT length: 0.898 ms.
Best time for 112K FFT length: 1.038 ms.
Best time for 128K FFT length: 1.074 ms.
Best time for 160K FFT length: 1.155 ms.
Best time for 192K FFT length: 1.111 ms.
Best time for 224K FFT length: 1.248 ms.
Best time for 256K FFT length: 1.400 ms.
Best time for 320K FFT length: 1.672 ms.
Best time for 384K FFT length: 2.007 ms.
Best time for 448K FFT length: 2.267 ms.
Best time for 512K FFT length: 2.592 ms.
Best time for 640K FFT length: 4.708 ms.
Best time for 768K FFT length: 5.365 ms.
Best time for 896K FFT length: 6.151 ms.
Best time for 1024K FFT length: 8.319 ms.
Best time for 1280K FFT length: 7.187 ms.
Best time for 1536K FFT length: 8.661 ms.
Best time for 1792K FFT length: 9.849 ms.
Best time for 2048K FFT length: 11.169 ms.
Best time for 2560K FFT length: 13.598 ms.
Best time for 3072K FFT length: 16.443 ms.
Best time for 3584K FFT length: 19.052 ms.
Best time for 4096K FFT length: 21.718 ms.
Best time for 5120K FFT length: 26.741 ms.
Best time for 6144K FFT length: 33.972 ms.
Best time for 7168K FFT length: 41.262 ms.
Best time for 8192K FFT length: 47.479 ms.
Best time for 10240K FFT length: 62.294 ms.
Best time for 12288K FFT length: 78.376 ms.
Best time for 14336K FFT length: 94.921 ms.
Best time for 16384K FFT length: 109.250 ms.
Best time for 20480K FFT length: 128.392 ms.
Best time for 24576K FFT length: 158.752 ms.
Best time for 28672K FFT length: 189.255 ms.
Best time for 32768K FFT length: 218.150 ms.
Best time for 58 bit trial factors: 2.920 ms.
Best time for 59 bit trial factors: 2.917 ms.
Best time for 60 bit trial factors: 2.933 ms.
Best time for 61 bit trial factors: 2.913 ms.
Best time for 62 bit trial factors: 2.923 ms.
Best time for 63 bit trial factors: 4.909 ms.
Best time for 64 bit trial factors: 4.913 ms.
Best time for 65 bit trial factors: 4.497 ms.
Best time for 66 bit trial factors: 4.463 ms.
Best time for 67 bit trial factors: 4.465 ms.

rx7350 · 2008-12-04, 13:39

The i7 benchmark times are better than the C2Ds, but not impressively so. However, with an integrated memory controller, I'm wondering how much the iteration times will decrease when doing 'real work'?

James Heinrich - have you started LL testing exponenets yet, and, if so, what are the iteration times, and what mix of work are you running on all cores? I would be particulary interested in iteration times when running a 2560 FFT exponent (LL test) in all four cores.

lycorn · 2008-12-04, 15:17

The drastic decrease in the iteration times shown in the first benchie (25.7.3) with two threads on one physical CPU seems rather strange to me. Normally the times decrease that much when you throw the second CORE in, not a second thread in the same core, which is the case. For the version 25.8, the times decrease by just the small amount expected in that situation, and it´s just when the second core kicks in that the times go significantly down.

Prime95 · 2008-12-04, 23:55

Quote:

Originally Posted by lycorn

The drastic decrease in the iteration times shown in the first benchie (25.7.3) with two threads on one physical CPU seems rather strange to me.

That's because of an affinity bug identifying the hyperthreaded CPUs in 25.7. It was actually using two physical CPUs.

James Heinrich · 2008-12-05, 00:26

Quote:

Originally Posted by rx7350

have you started LL testing exponenets yet, and, if so, what are the iteration times, and what mix of work are you running on all cores? I would be particulary interested in iteration times when running a 2560 FFT exponent (LL test) in all four cores.

Sorry, it's not actually my system. I had access to run benchmarks for a few minutes, I don't actually have $4500 to spare to buy this system myself

lavalamp · 2008-12-24, 19:04

Here's a benchmark I just ran on 64 bit Prime95 v25.9 under Vista SP1 64 bit on an i7 965 overclocked to 4.2 GHz.

However, both Vista and Prime95 get the speed wrong and say it's 4.032 GHz, which would be correct if I was running 24*168, but I'm running 25*168. CPUZ and Everest (not to mention BIOS) report the correct frequency.

Memory - 10*168 = 1680 MHz
Uncore - 20*168 = 3360 MHz
QPI - 44*168 = 7392 MHz

Edit: I should also mention that I have Turbo mode disabled so it isn't that messing up the speeds, and I've also disabled all other clock speed altering features I can find such as EIST. And since I'm already editing, I may as well mention I have HT on.

Uncwilly · 2008-12-24, 21:51

Quote:

Originally Posted by lavalamp

Here's a benchmark I just ran on 64 bit Prime95 v25.9 under Vista SP1 64 bit on an i7 965 overclocked to 4.2 GHz.

Me want.

I would love to throw that at the 100mdpp numbers.

henryzz · 2008-12-25, 20:18

Quote:

Originally Posted by lavalamp

However, both Vista and Prime95 get the speed wrong and say it's 4.032 GHz, which would be correct if I was running 24*168, but I'm running 25*168. CPUZ and Everest (not to mention BIOS) report the correct frequency.

prime95 seems to get the speed of the cpu wrong if the multiplier isnt the standard
a few days ago i underclocked my Q6600 to the minimum 6x200 and prime95 detected the cpu speed 1.8 GHz instead of 1.2
i suspect if vista got it wrong for you then prime95 gets it cpu speed from the operating system
is anyone able to try this with xp or earlier

Xyzzy · 2008-12-27, 03:34

This benchmark done with 64-bit Debian. The 64-bit Vista benchmark we performed was a little faster overall but we do not plan to use Windows. We wonder why the Linux version is slower.

We have not had time to analyze the results to determine what work this box is best for. We are just happy it easily runs Linux and that it was cheap enough to buy 2 of them.

Each box has 6GiB of PC2-6400 memory configured as 2x2GiB and 2x1GiB. We are tempted to randomly move the memory around to end up with 1 8GiB box and 1 4GiB box.

The boxes run significantly cooler compared to our older 65nm Q6600 C2Q. We think the 9550 is a 65nm CPU with a 95W TDP. We verified that the CPU has the fixed "B3" stepping (?) to eliminate the "TLB" problem.

Code:

AMD Phenom(tm) 9550 Quad-Core Processor
CPU speed: 2209.26 MHz, 4 cores
CPU features: RDTSC, CMOV, Prefetch, 3DNow!, MMX, SSE, SSE2
L1 cache size: 64 KB
L2 cache size: 512 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
L1 TLBS: 48
L2 TLBS: 512
Prime95 64-bit version 25.7, RdtscTiming=1
Best time for 4K FFT length: 0.061 ms.
Best time for 5K FFT length: 0.079 ms.
Best time for 6K FFT length: 0.098 ms.
Best time for 7K FFT length: 0.126 ms.
Best time for 8K FFT length: 0.135 ms.
Best time for 10K FFT length: 0.187 ms.
Best time for 12K FFT length: 0.232 ms.
Best time for 14K FFT length: 0.276 ms.
Best time for 16K FFT length: 0.307 ms.
Best time for 20K FFT length: 0.382 ms.
Best time for 24K FFT length: 0.466 ms.
Best time for 28K FFT length: 0.564 ms.
Best time for 32K FFT length: 0.629 ms.
Best time for 40K FFT length: 0.849 ms.
Best time for 48K FFT length: 1.048 ms.
Best time for 56K FFT length: 1.249 ms.
Best time for 64K FFT length: 1.397 ms.
Best time for 80K FFT length: 1.856 ms.
Best time for 96K FFT length: 2.280 ms.
Best time for 112K FFT length: 2.726 ms.
Best time for 128K FFT length: 3.025 ms.
Best time for 160K FFT length: 3.637 ms.
Best time for 192K FFT length: 4.554 ms.
Best time for 224K FFT length: 5.691 ms.
Best time for 256K FFT length: 6.293 ms.
Best time for 320K FFT length: 7.934 ms.
Best time for 384K FFT length: 9.743 ms.
Best time for 448K FFT length: 11.669 ms.
Best time for 512K FFT length: 13.152 ms.
Best time for 640K FFT length: 17.631 ms.
Best time for 768K FFT length: 21.720 ms.
Best time for 896K FFT length: 26.135 ms.
Best time for 1024K FFT length: 29.398 ms.
Best time for 1280K FFT length: 36.024 ms.
Best time for 1536K FFT length: 44.867 ms.
Best time for 1792K FFT length: 53.138 ms.
Best time for 2048K FFT length: 60.868 ms.
Best time for 2560K FFT length: 79.030 ms.
Best time for 3072K FFT length: 96.597 ms.
Best time for 3584K FFT length: 114.752 ms.
Best time for 4096K FFT length: 129.854 ms.
Best time for 5120K FFT length: 173.594 ms.
Best time for 6144K FFT length: 214.310 ms.
Best time for 7168K FFT length: 261.567 ms.
Best time for 8192K FFT length: 298.422 ms.
Best time for 10240K FFT length: 375.800 ms.
Best time for 12288K FFT length: 458.715 ms.
Best time for 14336K FFT length: 556.367 ms.
Best time for 16384K FFT length: 645.672 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.061 ms.
Best time for 5K FFT length: 0.079 ms.
Best time for 6K FFT length: 0.098 ms.
Best time for 7K FFT length: 0.126 ms.
Best time for 8K FFT length: 0.136 ms.
Best time for 10K FFT length: 0.239 ms.
Best time for 12K FFT length: 0.226 ms.
Best time for 14K FFT length: 0.219 ms.
Best time for 16K FFT length: 0.251 ms.
Best time for 20K FFT length: 0.302 ms.
Best time for 24K FFT length: 0.356 ms.
Best time for 28K FFT length: 0.427 ms.
Best time for 32K FFT length: 0.475 ms.
Best time for 40K FFT length: 1.370 ms.
Best time for 48K FFT length: 1.270 ms.
Best time for 56K FFT length: 1.596 ms.
Best time for 64K FFT length: 1.602 ms.
Best time for 80K FFT length: 1.815 ms.
Best time for 96K FFT length: 1.701 ms.
Best time for 112K FFT length: 2.008 ms.
Best time for 128K FFT length: 2.262 ms.
Best time for 160K FFT length: 2.624 ms.
Best time for 192K FFT length: 3.176 ms.
Best time for 224K FFT length: 3.756 ms.
Best time for 256K FFT length: 4.249 ms.
Best time for 320K FFT length: 6.091 ms.
Best time for 384K FFT length: 7.367 ms.
Best time for 448K FFT length: 8.772 ms.
Best time for 512K FFT length: 9.912 ms.
Best time for 640K FFT length: 12.008 ms.
Best time for 768K FFT length: 14.679 ms.
Best time for 896K FFT length: 19.440 ms.
Best time for 1024K FFT length: 22.147 ms.
Best time for 1280K FFT length: 26.724 ms.
Best time for 1536K FFT length: 32.666 ms.
Best time for 1792K FFT length: 38.026 ms.
Best time for 2048K FFT length: 44.282 ms.
Best time for 2560K FFT length: 57.106 ms.
Best time for 3072K FFT length: 69.353 ms.
Best time for 3584K FFT length: 81.249 ms.
Best time for 4096K FFT length: 93.375 ms.
Best time for 5120K FFT length: 116.962 ms.
Best time for 6144K FFT length: 146.003 ms.
Best time for 7168K FFT length: 174.673 ms.
Best time for 8192K FFT length: 198.231 ms.
Best time for 10240K FFT length: 245.830 ms.
Best time for 12288K FFT length: 303.108 ms.
Best time for 14336K FFT length: 365.337 ms.
Best time for 16384K FFT length: 416.781 ms.
[Sat Dec 27 02:43:39 2008]
Timing FFTs using 3 threads.
Best time for 4K FFT length: 0.061 ms.
Best time for 5K FFT length: 0.080 ms.
Best time for 6K FFT length: 0.099 ms.
Best time for 7K FFT length: 0.126 ms.
Best time for 8K FFT length: 0.137 ms.
Best time for 10K FFT length: 0.209 ms.
Best time for 12K FFT length: 0.264 ms.
Best time for 14K FFT length: 0.286 ms.
Best time for 16K FFT length: 0.297 ms.
Best time for 20K FFT length: 0.351 ms.
Best time for 24K FFT length: 0.397 ms.
Best time for 28K FFT length: 0.443 ms.
Best time for 32K FFT length: 0.483 ms.
Best time for 40K FFT length: 1.376 ms.
Best time for 48K FFT length: 1.384 ms.
Best time for 56K FFT length: 1.523 ms.
Best time for 64K FFT length: 1.601 ms.
Best time for 80K FFT length: 1.828 ms.
Best time for 96K FFT length: 1.958 ms.
Best time for 112K FFT length: 1.970 ms.
Best time for 128K FFT length: 2.255 ms.
Best time for 160K FFT length: 2.416 ms.
Best time for 192K FFT length: 2.923 ms.
Best time for 224K FFT length: 3.323 ms.
Best time for 256K FFT length: 3.702 ms.
Best time for 320K FFT length: 5.783 ms.
Best time for 384K FFT length: 7.128 ms.
Best time for 448K FFT length: 8.057 ms.
Best time for 512K FFT length: 9.221 ms.
Best time for 640K FFT length: 11.140 ms.
Best time for 768K FFT length: 13.422 ms.
Best time for 896K FFT length: 21.799 ms.
Best time for 1024K FFT length: 24.119 ms.
Best time for 1280K FFT length: 27.895 ms.
Best time for 1536K FFT length: 31.639 ms.
Best time for 1792K FFT length: 35.759 ms.
Best time for 2048K FFT length: 40.462 ms.
Best time for 2560K FFT length: 58.671 ms.
Best time for 3072K FFT length: 65.984 ms.
Best time for 3584K FFT length: 74.562 ms.
Best time for 4096K FFT length: 84.000 ms.
Best time for 5120K FFT length: 91.984 ms.
Best time for 6144K FFT length: 109.437 ms.
Best time for 7168K FFT length: 129.379 ms.
Best time for 8192K FFT length: 144.422 ms.
Best time for 10240K FFT length: 191.983 ms.
Best time for 12288K FFT length: 226.256 ms.
Best time for 14336K FFT length: 267.539 ms.
Best time for 16384K FFT length: 298.965 ms.
Timing FFTs using 4 threads.
Best time for 4K FFT length: 0.061 ms.
Best time for 5K FFT length: 0.080 ms.
Best time for 6K FFT length: 0.099 ms.
Best time for 7K FFT length: 0.125 ms.
Best time for 8K FFT length: 0.136 ms.
Best time for 10K FFT length: 0.219 ms.
Best time for 12K FFT length: 0.227 ms.
Best time for 14K FFT length: 0.250 ms.
Best time for 16K FFT length: 0.271 ms.
Best time for 20K FFT length: 0.315 ms.
Best time for 24K FFT length: 0.356 ms.
Best time for 28K FFT length: 0.402 ms.
Best time for 32K FFT length: 0.446 ms.
Best time for 40K FFT length: 1.272 ms.
Best time for 48K FFT length: 1.436 ms.
Best time for 56K FFT length: 1.465 ms.
Best time for 64K FFT length: 1.269 ms.
Best time for 80K FFT length: 1.686 ms.
Best time for 96K FFT length: 1.812 ms.
Best time for 112K FFT length: 2.055 ms.
Best time for 128K FFT length: 2.160 ms.
Best time for 160K FFT length: 2.262 ms.
Best time for 192K FFT length: 2.767 ms.
Best time for 224K FFT length: 3.143 ms.
Best time for 256K FFT length: 3.452 ms.
Best time for 320K FFT length: 5.824 ms.
Best time for 384K FFT length: 6.365 ms.
Best time for 448K FFT length: 7.645 ms.
Best time for 512K FFT length: 8.738 ms.
Best time for 640K FFT length: 10.797 ms.
Best time for 768K FFT length: 12.442 ms.
Best time for 896K FFT length: 19.084 ms.
Best time for 1024K FFT length: 22.212 ms.
Best time for 1280K FFT length: 25.697 ms.
Best time for 1536K FFT length: 29.777 ms.
Best time for 1792K FFT length: 33.300 ms.
Best time for 2048K FFT length: 37.999 ms.
Best time for 2560K FFT length: 54.037 ms.
Best time for 3072K FFT length: 61.452 ms.
Best time for 3584K FFT length: 69.847 ms.
Best time for 4096K FFT length: 78.088 ms.
Best time for 5120K FFT length: 85.693 ms.
Best time for 6144K FFT length: 102.084 ms.
Best time for 7168K FFT length: 119.986 ms.
Best time for 8192K FFT length: 134.168 ms.
Best time for 10240K FFT length: 176.884 ms.
Best time for 12288K FFT length: 208.640 ms.
Best time for 14336K FFT length: 245.829 ms.
Best time for 16384K FFT length: 274.804 ms.
Best time for 58 bit trial factors: 3.621 ms.
Best time for 59 bit trial factors: 3.619 ms.
Best time for 60 bit trial factors: 3.900 ms.
Best time for 61 bit trial factors: 3.838 ms.
Best time for 62 bit trial factors: 4.551 ms.
Best time for 63 bit trial factors: 5.210 ms.
Best time for 64 bit trial factors: 6.345 ms.
Best time for 65 bit trial factors: 7.401 ms.
Best time for 66 bit trial factors: 7.348 ms.
Best time for 67 bit trial factors: 7.335 ms.

garo · 2008-12-27, 11:47

For comparison here are the benchmarks from a dual-core Opteron 2216 at 2400MHz. Ignore the two thread FFT timings as the other core was loaded at the time and the timings were a lot worse - about 10 times worse than single thread times. I don't know why they should be worse than single core timings. It seems that for multithread benchmarks when the first core is loaded mprime tries to use that anyway and ignores the other core which is sitting idle.

Code:

Dual-Core AMD Opteron(tm) Processor 2216
CPU speed: 2399.43 MHz, 2 cores
CPU features: RDTSC, CMOV, Prefetch, 3DNow!, MMX, SSE, SSE2
L1 cache size: 64 KB
L2 cache size: 1 MB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
L1 TLBS: 32
L2 TLBS: 512
Prime95 64-bit version 25.8, RdtscTiming=1
Best time for 768K FFT length: 31.017 ms.
Best time for 896K FFT length: 37.082 ms.
Best time for 1024K FFT length: 41.118 ms.
Best time for 1280K FFT length: 52.565 ms.
Best time for 1536K FFT length: 64.011 ms.
Best time for 1792K FFT length: 77.507 ms.
Best time for 2048K FFT length: 86.438 ms.
Best time for 2560K FFT length: 114.380 ms.
Best time for 3072K FFT length: 139.141 ms.
Best time for 3584K FFT length: 167.903 ms.
Best time for 4096K FFT length: 187.045 ms.
Best time for 5120K FFT length: 244.509 ms.
Best time for 6144K FFT length: 301.812 ms.
Best time for 7168K FFT length: 371.209 ms.
Best time for 8192K FFT length: 441.030 ms.
Timing FFTs using 2 threads.
Best time for 768K FFT length: 316.454 ms.
Best time for 896K FFT length: 327.884 ms.
Best time for 1024K FFT length: 447.618 ms.
Best time for 1280K FFT length: 549.972 ms.
Best time for 1536K FFT length: 911.054 ms.
Best time for 1792K FFT length: 1171.418 ms.
Best time for 2048K FFT length: 1469.092 ms.
Best time for 2560K FFT length: 1376.642 ms.
Best time for 3072K FFT length: 1770.606 ms.
Best time for 3584K FFT length: 2014.975 ms.
Best time for 4096K FFT length: 4136.921 ms.
Best time for 5120K FFT length: 1728.160 ms.
Best time for 6144K FFT length: 2419.674 ms.
Best time for 7168K FFT length: 2718.081 ms.
Best time for 8192K FFT length: 2942.590 ms.
Best time for 58 bit trial factors: 3.031 ms.
Best time for 59 bit trial factors: 3.091 ms.
Best time for 60 bit trial factors: 3.086 ms.
Best time for 61 bit trial factors: 3.295 ms.
Best time for 62 bit trial factors: 3.292 ms.
Best time for 63 bit trial factors: 3.935 ms.
Best time for 64 bit trial factors: 4.609 ms.
Best time for 65 bit trial factors: 5.626 ms.
Best time for 66 bit trial factors: 6.708 ms.
Best time for 67 bit trial factors: 6.667 ms.

retina · 2008-12-27, 11:52

Quote:

Originally Posted by garo

I don't know why they should be worse than single core timings. It seems that for multithread benchmarks when the first core is loaded mprime tries to use that anyway and ignores the other core which is sitting idle.

Perhaps it is the synchronisation causing it. One core has to wait for the other to complete its assigned job before it can continue to the next part. Just a guess, I have not examined the code for P95, so I could be completely wrong (and it wouldn't be the first time).

Freightyard · 2008-12-27, 19:53

Prime95 25.8 32-bit vs 64-bit comparison -- notice 64-bit is slightly faster. Next, I will try some system optimizations (turning off background processes) and moderate overclocking...

Core i7 965 3.20 GHz
6 GB 1600 MHz DDR3
Both run on Vista Ultimate x64

v25.8 32-bit:

Code:

[Sat Dec 27 11:43:22 2008]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU         965  @ 3.20GHz
CPU speed: 3200.19 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8064 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 32-bit version 25.8, RdtscTiming=1
Best time for 768K FFT length: 12.788 ms.
Best time for 896K FFT length: 15.274 ms.
Best time for 1024K FFT length: 17.836 ms.
Best time for 1280K FFT length: 22.780 ms.
Best time for 1536K FFT length: 27.810 ms.
Best time for 1792K FFT length: 33.225 ms.
Best time for 2048K FFT length: 36.987 ms.
Best time for 2560K FFT length: 46.829 ms.
Best time for 3072K FFT length: 57.208 ms.
Best time for 3584K FFT length: 68.374 ms.
Best time for 4096K FFT length: 77.713 ms.
Best time for 5120K FFT length: 98.463 ms.
Best time for 6144K FFT length: 118.721 ms.
Best time for 7168K FFT length: 145.209 ms.
Best time for 8192K FFT length: 160.652 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 11.872 ms.
Best time for 896K FFT length: 14.180 ms.
Best time for 1024K FFT length: 16.208 ms.
Best time for 1280K FFT length: 20.046 ms.
Best time for 1536K FFT length: 24.350 ms.
Best time for 1792K FFT length: 29.039 ms.
Best time for 2048K FFT length: 32.203 ms.
Best time for 2560K FFT length: 42.506 ms.
Best time for 3072K FFT length: 51.819 ms.
Best time for 3584K FFT length: 62.680 ms.
Best time for 4096K FFT length: 69.727 ms.
Best time for 5120K FFT length: 89.028 ms.
Best time for 6144K FFT length: 107.188 ms.
Best time for 7168K FFT length: 128.920 ms.
Best time for 8192K FFT length: 142.922 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 7.895 ms.
Best time for 896K FFT length: 8.904 ms.
Best time for 1024K FFT length: 12.328 ms.
Best time for 1280K FFT length: 10.773 ms.
Best time for 1536K FFT length: 12.900 ms.
Best time for 1792K FFT length: 15.009 ms.
Best time for 2048K FFT length: 16.992 ms.
Best time for 2560K FFT length: 21.732 ms.
Best time for 3072K FFT length: 26.537 ms.
Best time for 3584K FFT length: 31.891 ms.
Best time for 4096K FFT length: 35.505 ms.
Best time for 5120K FFT length: 45.393 ms.
Best time for 6144K FFT length: 54.511 ms.
Best time for 7168K FFT length: 65.562 ms.
Best time for 8192K FFT length: 72.602 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 6.726 ms.
Best time for 896K FFT length: 7.468 ms.
Best time for 1024K FFT length: 10.840 ms.
Best time for 1280K FFT length: 8.474 ms.
Best time for 1536K FFT length: 9.869 ms.
Best time for 1792K FFT length: 11.500 ms.
Best time for 2048K FFT length: 12.927 ms.
Best time for 2560K FFT length: 15.482 ms.
Best time for 3072K FFT length: 18.988 ms.
Best time for 3584K FFT length: 21.906 ms.
Best time for 4096K FFT length: 24.980 ms.
Best time for 5120K FFT length: 31.035 ms.
Best time for 6144K FFT length: 37.737 ms.
Best time for 7168K FFT length: 45.081 ms.
Best time for 8192K FFT length: 50.929 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 6.061 ms.
Best time for 896K FFT length: 6.728 ms.
Best time for 1024K FFT length: 9.826 ms.
Best time for 1280K FFT length: 7.452 ms.
Best time for 1536K FFT length: 11.827 ms.
Best time for 1792K FFT length: 10.110 ms.
Best time for 2048K FFT length: 14.350 ms.
Best time for 2560K FFT length: 13.819 ms.
Best time for 3072K FFT length: 16.615 ms.
Best time for 3584K FFT length: 19.140 ms.
Best time for 4096K FFT length: 21.856 ms.
Best time for 5120K FFT length: 26.682 ms.
Best time for 6144K FFT length: 32.361 ms.
Best time for 7168K FFT length: 38.490 ms.
Best time for 8192K FFT length: 44.472 ms.
Best time for 58 bit trial factors: 2.987 ms.
Best time for 59 bit trial factors: 3.064 ms.
Best time for 60 bit trial factors: 3.069 ms.
Best time for 61 bit trial factors: 3.053 ms.
Best time for 62 bit trial factors: 3.071 ms.
Best time for 63 bit trial factors: 5.129 ms.
Best time for 64 bit trial factors: 5.131 ms.
Best time for 65 bit trial factors: 4.704 ms.
Best time for 66 bit trial factors: 4.687 ms.
Best time for 67 bit trial factors: 4.652 ms.

v25.8 64-bit:

Code:

[Sat Dec 27 11:33:44 2008]
Compare your results to other computers at http://www.mersenne.org/report_benchmarks
Intel(R) Core(TM) i7 CPU         965  @ 3.20GHz
CPU speed: 3200.25 MHz, 4 hyperthreaded cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2, SSE4
L1 cache size: 32 KB
L2 cache size: 256 KB, L3 cache size: 8064 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 64
Prime95 64-bit version 25.8, RdtscTiming=1
Best time for 768K FFT length: 12.456 ms.
Best time for 896K FFT length: 15.104 ms.
Best time for 1024K FFT length: 17.513 ms.
Best time for 1280K FFT length: 22.572 ms.
Best time for 1536K FFT length: 27.685 ms.
Best time for 1792K FFT length: 33.148 ms.
Best time for 2048K FFT length: 36.760 ms.
Best time for 2560K FFT length: 46.268 ms.
Best time for 3072K FFT length: 57.111 ms.
Best time for 3584K FFT length: 68.143 ms.
Best time for 4096K FFT length: 77.640 ms.
Best time for 5120K FFT length: 98.536 ms.
Best time for 6144K FFT length: 118.232 ms.
Best time for 7168K FFT length: 144.138 ms.
Best time for 8192K FFT length: 159.407 ms.
Timing FFTs using 2 threads on 1 physical CPUs.
Best time for 768K FFT length: 11.425 ms.
Best time for 896K FFT length: 13.818 ms.
Best time for 1024K FFT length: 15.805 ms.
Best time for 1280K FFT length: 19.891 ms.
Best time for 1536K FFT length: 24.300 ms.
Best time for 1792K FFT length: 29.181 ms.
Best time for 2048K FFT length: 31.378 ms.
Best time for 2560K FFT length: 42.715 ms.
Best time for 3072K FFT length: 52.190 ms.
Best time for 3584K FFT length: 62.650 ms.
Best time for 4096K FFT length: 70.092 ms.
Best time for 5120K FFT length: 89.259 ms.
Best time for 6144K FFT length: 106.710 ms.
Best time for 7168K FFT length: 129.246 ms.
Best time for 8192K FFT length: 142.946 ms.
Timing FFTs using 4 threads on 2 physical CPUs.
Best time for 768K FFT length: 7.728 ms.
Best time for 896K FFT length: 8.404 ms.
Best time for 1024K FFT length: 11.493 ms.
Best time for 1280K FFT length: 10.701 ms.
Best time for 1536K FFT length: 12.917 ms.
Best time for 1792K FFT length: 15.146 ms.
Best time for 2048K FFT length: 16.926 ms.
Best time for 2560K FFT length: 21.580 ms.
Best time for 3072K FFT length: 26.561 ms.
Best time for 3584K FFT length: 32.208 ms.
Best time for 4096K FFT length: 35.634 ms.
Best time for 5120K FFT length: 45.296 ms.
Best time for 6144K FFT length: 55.814 ms.
Best time for 7168K FFT length: 65.725 ms.
Best time for 8192K FFT length: 72.016 ms.
Timing FFTs using 6 threads on 3 physical CPUs.
Best time for 768K FFT length: 6.531 ms.
Best time for 896K FFT length: 7.380 ms.
Best time for 1024K FFT length: 10.415 ms.
Best time for 1280K FFT length: 8.337 ms.
Best time for 1536K FFT length: 10.010 ms.
Best time for 1792K FFT length: 11.288 ms.
Best time for 2048K FFT length: 12.873 ms.
Best time for 2560K FFT length: 15.652 ms.
Best time for 3072K FFT length: 18.779 ms.
Best time for 3584K FFT length: 21.855 ms.
Best time for 4096K FFT length: 24.839 ms.
Best time for 5120K FFT length: 30.963 ms.
Best time for 6144K FFT length: 37.708 ms.
Best time for 7168K FFT length: 45.105 ms.
Best time for 8192K FFT length: 50.962 ms.
Timing FFTs using 8 threads on 4 physical CPUs.
Best time for 768K FFT length: 5.860 ms.
Best time for 896K FFT length: 6.621 ms.
Best time for 1024K FFT length: 9.411 ms.
Best time for 1280K FFT length: 7.297 ms.
Best time for 1536K FFT length: 8.735 ms.
Best time for 1792K FFT length: 9.884 ms.
Best time for 2048K FFT length: 14.211 ms.
Best time for 2560K FFT length: 13.596 ms.
Best time for 3072K FFT length: 16.441 ms.
Best time for 3584K FFT length: 18.911 ms.
Best time for 4096K FFT length: 21.624 ms.
Best time for 5120K FFT length: 26.377 ms.
Best time for 6144K FFT length: 32.239 ms.
Best time for 7168K FFT length: 38.523 ms.
Best time for 8192K FFT length: 44.362 ms.
Best time for 58 bit trial factors: 2.365 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: 2.702 ms.
Best time for 62 bit trial factors: 2.848 ms.
Best time for 63 bit trial factors: 3.381 ms.
Best time for 64 bit trial factors: 4.199 ms.
Best time for 65 bit trial factors: 4.441 ms.
Best time for 66 bit trial factors: 4.655 ms.
Best time for 67 bit trial factors: 4.623 ms.

lycorn · 2008-12-28, 18:26

Quote:

Originally Posted by Freightyard

Prime95 25.8 32-bit vs 64-bit comparison -- notice 64-bit is slightly faster.

That may be due to Nehalem allowing macro-ops fusion for 64-bits instructions, whereas Conroe would only do it on 32-bits. 64-bit code may in general benefit slightly from the use of Nehalem.

Uncwilly · 2008-12-29, 01:33

Here are the runs for my Fujitsu Lifebook N series

In Safe Mode:

Code:

Intel(R) Core(TM)2 Duo CPU     T8300  @ 2.40GHz
CPU speed: 2393.99 MHz, 2 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 3072 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.6, RdtscTiming=1
Best time for 4K FFT length: 0.055 ms.
Best time for 5K FFT length: 0.081 ms.
Best time for 6K FFT length: 0.096 ms.
Best time for 7K FFT length: 0.116 ms.
Best time for 8K FFT length: 0.120 ms.
Best time for 10K FFT length: 0.169 ms.
Best time for 12K FFT length: 0.208 ms.
Best time for 14K FFT length: 0.249 ms.
Best time for 16K FFT length: 0.263 ms.
Best time for 20K FFT length: 0.353 ms.
Best time for 24K FFT length: 0.428 ms.
Best time for 28K FFT length: 0.530 ms.
Best time for 32K FFT length: 0.553 ms.
Best time for 40K FFT length: 0.722 ms.
Best time for 48K FFT length: 0.875 ms.
Best time for 56K FFT length: 1.069 ms.
Best time for 64K FFT length: 1.141 ms.
Best time for 80K FFT length: 1.609 ms.
Best time for 96K FFT length: 1.959 ms.
Best time for 112K FFT length: 2.362 ms.
Best time for 128K FFT length: 2.512 ms.
Best time for 160K FFT length: 3.086 ms.
Best time for 192K FFT length: 3.795 ms.
Best time for 224K FFT length: 4.525 ms.
Best time for 256K FFT length: 5.012 ms.
Best time for 320K FFT length: 6.514 ms.
Best time for 384K FFT length: 8.070 ms.
Best time for 448K FFT length: 9.708 ms.
Best time for 512K FFT length: 10.843 ms.
Best time for 640K FFT length: 14.443 ms.
Best time for 768K FFT length: 17.739 ms.
Best time for 896K FFT length: 21.136 ms.
Best time for 1024K FFT length: 24.438 ms.
Best time for 1280K FFT length: 29.876 ms.
Best time for 1536K FFT length: 36.451 ms.
Best time for 1792K FFT length: 43.330 ms.
Best time for 2048K FFT length: 48.106 ms.
Best time for 2560K FFT length: 63.450 ms.
Best time for 3072K FFT length: 77.505 ms.
Best time for 3584K FFT length: 92.166 ms.
Best time for 4096K FFT length: 103.026 ms.
Best time for 5120K FFT length: 131.929 ms.
Best time for 6144K FFT length: 159.328 ms.
Best time for 7168K FFT length: 193.605 ms.
Best time for 8192K FFT length: 212.122 ms.
Best time for 10240K FFT length: 284.213 ms.
Best time for 12288K FFT length: 347.446 ms.
Best time for 14336K FFT length: 421.633 ms.
Best time for 16384K FFT length: 463.288 ms.
Best time for 20480K FFT length: 633.442 ms.
Best time for 24576K FFT length: 773.084 ms.
Best time for 28672K FFT length: 924.279 ms.
Best time for 32768K FFT length: 1016.381 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.055 ms.
Best time for 5K FFT length: 0.081 ms.
Best time for 6K FFT length: 0.096 ms.
Best time for 7K FFT length: 0.116 ms.
Best time for 8K FFT length: 0.120 ms.
Best time for 10K FFT length: 0.157 ms.
Best time for 12K FFT length: 0.147 ms.
Best time for 14K FFT length: 0.162 ms.
Best time for 16K FFT length: 0.190 ms.
Best time for 20K FFT length: 0.218 ms.
Best time for 24K FFT length: 0.252 ms.
Best time for 28K FFT length: 0.306 ms.
Best time for 32K FFT length: 0.321 ms.
Best time for 40K FFT length: 0.926 ms.
Best time for 48K FFT length: 0.961 ms.
Best time for 56K FFT length: 1.071 ms.
Best time for 64K FFT length: 1.106 ms.
Best time for 80K FFT length: 1.263 ms.
Best time for 96K FFT length: 1.274 ms.
Best time for 112K FFT length: 1.332 ms.
Best time for 128K FFT length: 1.540 ms.
Best time for 160K FFT length: 1.686 ms.
Best time for 192K FFT length: 1.997 ms.
Best time for 224K FFT length: 2.373 ms.
Best time for 256K FFT length: 2.636 ms.
Best time for 320K FFT length: 3.444 ms.
Best time for 384K FFT length: 4.265 ms.
Best time for 448K FFT length: 5.134 ms.
Best time for 512K FFT length: 5.769 ms.
Best time for 640K FFT length: 7.888 ms.
Best time for 768K FFT length: 9.724 ms.
Best time for 896K FFT length: 11.591 ms.
Best time for 1024K FFT length: 13.628 ms.
Best time for 1280K FFT length: 16.233 ms.
Best time for 1536K FFT length: 19.710 ms.
Best time for 1792K FFT length: 23.539 ms.
Best time for 2048K FFT length: 26.324 ms.
Best time for 2560K FFT length: 34.174 ms.
Best time for 3072K FFT length: 41.476 ms.
Best time for 3584K FFT length: 49.373 ms.
Best time for 4096K FFT length: 55.409 ms.
Best time for 5120K FFT length: 70.696 ms.
Best time for 6144K FFT length: 86.309 ms.
Best time for 7168K FFT length: 104.079 ms.
Best time for 8192K FFT length: 116.549 ms.
Best time for 10240K FFT length: 148.466 ms.
Best time for 12288K FFT length: 181.124 ms.
Best time for 14336K FFT length: 218.482 ms.
Best time for 16384K FFT length: 244.767 ms.
Best time for 20480K FFT length: 341.957 ms.
Best time for 24576K FFT length: 424.301 ms.
Best time for 28672K FFT length: 494.244 ms.
Best time for 32768K FFT length: 542.375 ms.
Best time for 58 bit trial factors: 4.309 ms.
Best time for 59 bit trial factors: 4.310 ms.
Best time for 60 bit trial factors: 4.307 ms.
Best time for 61 bit trial factors: 4.302 ms.
Best time for 62 bit trial factors: 7.304 ms.
Best time for 63 bit trial factors: 7.326 ms.
Best time for 64 bit trial factors: 6.777 ms.
Best time for 65 bit trial factors: 6.749 ms.
Best time for 66 bit trial factors: 6.734 ms.
Best time for 67 bit trial factors: 6.716 ms.

Standard mode:

Code:

Intel(R) Core(TM)2 Duo CPU     T8300  @ 2.40GHz
CPU speed: 2393.74 MHz, 2 cores
CPU features: RDTSC, CMOV, Prefetch, MMX, SSE, SSE2
L1 cache size: 32 KB
L2 cache size: 3072 KB
L1 cache line size: 64 bytes
L2 cache line size: 64 bytes
TLBS: 256
Prime95 32-bit version 25.6, RdtscTiming=1
Best time for 4K FFT length: 0.055 ms.
Best time for 5K FFT length: 0.081 ms.
Best time for 6K FFT length: 0.095 ms.
Best time for 7K FFT length: 0.107 ms.
Best time for 8K FFT length: 0.110 ms.
Best time for 10K FFT length: 0.155 ms.
Best time for 12K FFT length: 0.190 ms.
Best time for 14K FFT length: 0.230 ms.
Best time for 16K FFT length: 0.243 ms.
Best time for 20K FFT length: 0.324 ms.
Best time for 24K FFT length: 0.396 ms.
Best time for 28K FFT length: 0.489 ms.
Best time for 32K FFT length: 0.511 ms.
Best time for 40K FFT length: 0.667 ms.
Best time for 48K FFT length: 0.807 ms.
Best time for 56K FFT length: 0.987 ms.
Best time for 64K FFT length: 1.054 ms.
Best time for 80K FFT length: 1.485 ms.
Best time for 96K FFT length: 1.807 ms.
Best time for 112K FFT length: 2.183 ms.
Best time for 128K FFT length: 2.318 ms.
Best time for 160K FFT length: 2.849 ms.
Best time for 192K FFT length: 3.504 ms.
Best time for 224K FFT length: 4.176 ms.
Best time for 256K FFT length: 4.643 ms.
Best time for 320K FFT length: 6.025 ms.
Best time for 384K FFT length: 7.492 ms.
Best time for 448K FFT length: 9.023 ms.
Best time for 512K FFT length: 10.107 ms.
Best time for 640K FFT length: 13.472 ms.
Best time for 768K FFT length: 16.695 ms.
Best time for 896K FFT length: 19.929 ms.
Best time for 1024K FFT length: 23.071 ms.
Best time for 1280K FFT length: 28.338 ms.
Best time for 1536K FFT length: 34.502 ms.
Best time for 1792K FFT length: 44.119 ms.
Best time for 2048K FFT length: 49.067 ms.
Best time for 2560K FFT length: 64.672 ms.
Best time for 3072K FFT length: 78.852 ms.
Best time for 3584K FFT length: 87.954 ms.
Best time for 4096K FFT length: 98.101 ms.
Best time for 5120K FFT length: 125.420 ms.
Best time for 6144K FFT length: 154.790 ms.
Best time for 7168K FFT length: 188.334 ms.
Best time for 8192K FFT length: 202.024 ms.
Best time for 10240K FFT length: 269.291 ms.
Best time for 12288K FFT length: 325.543 ms.
Best time for 14336K FFT length: 394.450 ms.
Best time for 16384K FFT length: 446.469 ms.
Best time for 20480K FFT length: 600.071 ms.
Best time for 24576K FFT length: 735.307 ms.
Best time for 28672K FFT length: 884.776 ms.
Best time for 32768K FFT length: 969.536 ms.
Timing FFTs using 2 threads.
Best time for 4K FFT length: 0.050 ms.
Best time for 5K FFT length: 0.074 ms.
Best time for 6K FFT length: 0.088 ms.
Best time for 7K FFT length: 0.107 ms.
Best time for 8K FFT length: 0.110 ms.
Best time for 10K FFT length: 0.167 ms.
Best time for 12K FFT length: 0.158 ms.
Best time for 14K FFT length: 0.160 ms.
Best time for 16K FFT length: 0.182 ms.
Best time for 20K FFT length: 0.213 ms.
Best time for 24K FFT length: 0.255 ms.
Best time for 28K FFT length: 0.307 ms.
Best time for 32K FFT length: 0.322 ms.
Best time for 40K FFT length: 1.070 ms.
Best time for 48K FFT length: 1.103 ms.
Best time for 56K FFT length: 1.212 ms.
Best time for 64K FFT length: 1.249 ms.
Best time for 80K FFT length: 1.435 ms.
Best time for 96K FFT length: 1.350 ms.
Best time for 112K FFT length: 1.337 ms.
Best time for 128K FFT length: 1.488 ms.
Best time for 160K FFT length: 1.691 ms.
Best time for 192K FFT length: 2.005 ms.
Best time for 224K FFT length: 2.382 ms.
Best time for 256K FFT length: 2.654 ms.
Best time for 320K FFT length: 3.457 ms.
Best time for 384K FFT length: 4.324 ms.
Best time for 448K FFT length: 5.229 ms.
Best time for 512K FFT length: 5.934 ms.
Best time for 640K FFT length: 8.139 ms.
Best time for 768K FFT length: 10.042 ms.
Best time for 896K FFT length: 11.957 ms.
Best time for 1024K FFT length: 13.995 ms.
Best time for 1280K FFT length: 16.918 ms.
Best time for 1536K FFT length: 20.502 ms.
Best time for 1792K FFT length: 24.036 ms.
Best time for 2048K FFT length: 27.105 ms.
Best time for 2560K FFT length: 34.617 ms.
Best time for 3072K FFT length: 42.533 ms.
Best time for 3584K FFT length: 50.500 ms.
Best time for 4096K FFT length: 57.145 ms.
Best time for 5120K FFT length: 73.119 ms.
Best time for 6144K FFT length: 89.457 ms.
Best time for 7168K FFT length: 108.792 ms.
Best time for 8192K FFT length: 120.360 ms.
Best time for 10240K FFT length: 153.076 ms.
Best time for 12288K FFT length: 186.586 ms.
Best time for 14336K FFT length: 226.672 ms.
Best time for 16384K FFT length: 259.571 ms.
Best time for 20480K FFT length: 347.952 ms.
Best time for 24576K FFT length: 423.961 ms.
Best time for 28672K FFT length: 515.468 ms.
Best time for 32768K FFT length: 551.724 ms.
Best time for 58 bit trial factors: 4.299 ms.
Best time for 59 bit trial factors: 3.983 ms.
Best time for 60 bit trial factors: 3.972 ms.
Best time for 61 bit trial factors: 3.975 ms.
Best time for 62 bit trial factors: 6.792 ms.
Best time for 63 bit trial factors: 7.342 ms.
Best time for 64 bit trial factors: 6.257 ms.
Best time for 65 bit trial factors: 6.256 ms.
Best time for 66 bit trial factors: 6.219 ms.
Best time for 67 bit trial factors: 6.223 ms.

Running in safemode I get an actual performance gain much larger.
~2200 seconds between outputs in safemode vs. ~3300 seconds in standard.

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2008-12-02, 01:19	#426
stars10250 Jul 2008 San Francisco, CA C9₁₆ Posts	Sorry about the typo...it's DDR2 as you guessed. I was running my ram at 4-4-4-12 at 400MHz 1:1, but just changed it to 5-5-5-15 at 533MHz, 3:4. I must admit I just figured out how to make this change today! The strapping settings on the motherboard were a bit confusing (I'm a novice recall). Right now it is stress testing but it looks good so far (few hrs in). For fun I started my four LL's and the iteration time dropped from 65 ms to 60 ms across all four cores, which is a nice improvement. Core temps are all 45 degrees C right now during the stress test. For voltages, I had to crank things up from my earlier ram configuration. The VCore is happy at 1.3125V. Ram voltage is now at 2.1V which is the spec voltage (it didn't like anything less), and the northbridge is at 1.26V. The other voltages are on auto. Before the memory speed change it ran stable at 1.86 V, with the northbridge at 1.24V. I've tried 3.4 GHz several more times but I can only get it to run stable for about 10 minutes. It didn't feel comfortable so I backed down to 3.2 GHz which it seems to like. Anyway, I'm happy with my 8% performance improvement for the day :) Anything else I can tweak?

2008-12-02, 12:33	#429
stars10250 Jul 2008 San Francisco, CA 3·67 Posts	I'm interested in trying for more but here's my concern. Right now it is running 400FSB at 8x for 3.2 GHz. I can't use fractional multipliers, so I have to use 8x or 9x. Also, I'm not sure it would be worth lowering the FSB to say 378 MHz at 9x (to achieve 3.4 GHz), since I think I want to keep the FSB high for good memory speed (though maybe there is a good memory divider for a setting like this?). So I think the only way I can go faster is to go beyond 400 MHz FSB, like 425 MHz. The motherboard is rated for 1600 MHz, so is it ok if I push it to 1700 MHz? I haven't read as much about that. My core temperatures have always been low, partly because I have a big cooler (zerotherm-FZ120) and partly because it is winter time and the room temperatures are low. In the summer this room will be at least 10 degrees F hotter. I've run the Vcore in the 1.4V range before in my attempts at 3.4 GHz, but like I said I was only able to keep it stable for about 10 minutes. Do you have suggestions for 3.3 GHz, 3.4, or other FSB speeds?

2008-12-04, 13:39	#438
rx7350 Feb 2006 AR, US 90₁₆ Posts	The i7 benchmark times are better than the C2Ds, but not impressively so. However, with an integrated memory controller, I'm wondering how much the iteration times will decrease when doing 'real work'? James Heinrich - have you started LL testing exponenets yet, and, if so, what are the iteration times, and what mix of work are you running on all cores? I would be particulary interested in iteration times when running a 2560 FFT exponent (LL test) in all four cores.

2008-12-04, 15:17	#439
lycorn "GIMFS" Sep 2002 Oeiras, Portugal 2×11×67 Posts	The drastic decrease in the iteration times shown in the first benchie (25.7.3) with two threads on one physical CPU seems rather strange to me. Normally the times decrease that much when you throw the second CORE in, not a second thread in the same core, which is the case. For the version 25.8, the times decrease by just the small amount expected in that situation, and it´s just when the second core kicks in that the times go significantly down.