20200325, 16:59  #793  
"Kieren, ktony"
Jul 2011
3·3,167 Posts 
Quote:
EDIT: Here ya go. Last fiddled with by kladner on 20200325 at 17:49 

20200325, 21:18  #794  
Jul 2018
Martin, Slovakia
2·3 Posts 
Quote:
Is it possible that when RAM is faster than CPU clock, it will not be used the same as with faster CPU? I'm thinking about this exact thing, because I have 3200 MHz RAM now, and I want to know whether I should buy 4000 MHz or 4400 MHz RAM because my CPU is manually overclocked to 4,1 GHz (Ryzen 9 3900X). 

20200325, 22:02  #795 
P90 years forever!
Aug 2002
Yeehaw, FL
1A53_{16} Posts 

20200326, 01:51  #796 
Jun 2003
10664_{8} Posts 

20200326, 02:25  #797 
"Curtis"
Feb 2005
Riverside, CA
3×11^{3} Posts 
I think he was referring to the Ryzen?
Edit: 70MB L3, if my search result is to be believed. Last fiddled with by VBCurtis on 20200326 at 02:26 
20200326, 03:04  #798 
P90 years forever!
Aug 2002
Yeehaw, FL
23×293 Posts 

20200326, 03:40  #799 
Jun 2003
4532_{10} Posts 
Ok, makes sense. That still leaves the question of why mem speed is not affecting performance. I suppose, with just 4 cores, all of the tested RAM speeds are sufficient to feed the CPU.
Ryzen L3 are all powerof2, but since it is a victim cache, AMD specs list L2+L3 as a single "cache" number. So if you see 70MB for a processor, that is 64MB L3 + 6MB (12*512KB) L2. 
20200326, 16:15  #800 
"Kieren, ktony"
Jul 2011
251D_{16} Posts 
I have to note that the RAM speed was the same in all these runs. Only the CPU clock was different. I took the very similar results as an indication that this system is memorybound.
EDIT: Also, these tests were not run under strict lablike conditions. I did shut down obvious cyclestealing apps like performance monitors and browsers. In line with normal operation on the machine I deliberately left mfaktc running on the GPU as part of the environment. Allowance has to be made for marginoferror. Last fiddled with by kladner on 20200326 at 16:21 
20200330, 04:12  #801 
Jun 2010
Pennsylvania
13×71 Posts 
I didn't see any benchmarks here for the i57500, so here goes:
Code:
[Sun Mar 29 19:08:40 2020] Compare your results to other computers at http://www.mersenne.org/report_benchmarks Intel(R) Core(TM) i57500 CPU @ 3.40GHz CPU speed: 3371.20 MHz, 4 cores CPU features: Prefetchw, SSE, SSE2, SSE4, AVX, AVX2, FMA L1 cache size: 4x32 KB, L2 cache size: 4x256 KB, L3 cache size: 6 MB L1 cache line size: 64 bytes, L2 cache line size: 64 bytes Machine topology as determined by hwloc library: Machine#0 (total=28406668KB, Backend=Windows, hwlocVersion=2.0.4, ProcessName=prime95.exe) Package (total=28406668KB, CPUVendor=GenuineIntel, CPUFamilyNumber=6, CPUModelNumber=158, CPUModel="Intel(R) Core(TM) i57500 CPU @ 3.40GHz", CPUStepping=9) L3 (size=6144KB, linesize=64, ways=12, Inclusive=1) L2 (size=256KB, linesize=64, ways=4, Inclusive=0) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000001) PU#0 (cpuset: 0x00000001) L2 (size=256KB, linesize=64, ways=4, Inclusive=0) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000002) PU#1 (cpuset: 0x00000002) L2 (size=256KB, linesize=64, ways=4, Inclusive=0) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000004) PU#2 (cpuset: 0x00000004) L2 (size=256KB, linesize=64, ways=4, Inclusive=0) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000008) PU#3 (cpuset: 0x00000008) Prime95 64bit version 29.8, RdtscTiming=1 Timings for 2048K FFT length (4 cores, 1 worker): 2.53 ms. Throughput: 395.74 iter/sec. Timings for 2048K FFT length (4 cores, 4 workers): 10.69, 10.59, 10.39, 10.16 ms. Throughput: 382.59 iter/sec. Timings for 2304K FFT length (4 cores, 1 worker): 2.89 ms. Throughput: 346.50 iter/sec. Timings for 2304K FFT length (4 cores, 4 workers): 11.58, 11.32, 11.11, 11.06 ms. Throughput: 355.15 iter/sec. Timings for 2400K FFT length (4 cores, 1 worker): 3.00 ms. Throughput: 333.51 iter/sec. Timings for 2400K FFT length (4 cores, 4 workers): 12.26, 11.89, 11.78, 11.95 ms. Throughput: 334.20 iter/sec. Timings for 2560K FFT length (4 cores, 1 worker): 3.08 ms. Throughput: 324.68 iter/sec. Timings for 2560K FFT length (4 cores, 4 workers): 13.10, 12.72, 12.66, 12.57 ms. Throughput: 313.49 iter/sec. Timings for 2688K FFT length (4 cores, 1 worker): 3.39 ms. Throughput: 295.12 iter/sec. Timings for 2688K FFT length (4 cores, 4 workers): 13.30, 13.26, 13.18, 13.13 ms. Throughput: 302.63 iter/sec. Timings for 2880K FFT length (4 cores, 1 worker): 3.57 ms. Throughput: 280.17 iter/sec. Timings for 2880K FFT length (4 cores, 4 workers): 15.30, 14.57, 14.32, 14.28 ms. Throughput: 273.86 iter/sec. Timings for 3072K FFT length (4 cores, 1 worker): 3.74 ms. Throughput: 267.17 iter/sec. Timings for 3072K FFT length (4 cores, 4 workers): 15.53, 15.41, 15.03, 14.97 ms. Throughput: 262.61 iter/sec. Timings for 3200K FFT length (4 cores, 1 worker): 4.25 ms. Throughput: 235.31 iter/sec. Timings for 3200K FFT length (4 cores, 4 workers): 16.82, 16.34, 16.11, 16.10 ms. Throughput: 244.87 iter/sec. Timings for 3360K FFT length (4 cores, 1 worker): 4.45 ms. Throughput: 224.61 iter/sec. Timings for 3360K FFT length (4 cores, 4 workers): 17.95, 17.58, 17.29, 17.20 ms. Throughput: 228.55 iter/sec. [Sun Mar 29 19:13:44 2020] Timings for 3456K FFT length (4 cores, 1 worker): 4.34 ms. Throughput: 230.16 iter/sec. Timings for 3456K FFT length (4 cores, 4 workers): 17.76, 17.24, 17.24, 17.07 ms. Throughput: 230.91 iter/sec. Timings for 3584K FFT length (4 cores, 1 worker): 4.70 ms. Throughput: 212.98 iter/sec. Timings for 3584K FFT length (4 cores, 4 workers): 18.46, 17.98, 17.77, 17.95 ms. Throughput: 221.75 iter/sec. Timings for 3840K FFT length (4 cores, 1 worker): 4.86 ms. Throughput: 205.63 iter/sec. Timings for 3840K FFT length (4 cores, 4 workers): 20.57, 20.09, 19.75, 19.80 ms. Throughput: 199.52 iter/sec. Timings for 4096K FFT length (4 cores, 1 worker): 5.18 ms. Throughput: 192.93 iter/sec. Timings for 4096K FFT length (4 cores, 4 workers): 21.19, 21.17, 20.45, 20.43 ms. Throughput: 192.28 iter/sec. Timings for 4480K FFT length (4 cores, 1 worker): 5.90 ms. Throughput: 169.36 iter/sec. Timings for 4480K FFT length (4 cores, 4 workers): 23.51, 22.80, 22.65, 22.76 ms. Throughput: 174.50 iter/sec. Timings for 4608K FFT length (4 cores, 1 worker): 5.78 ms. Throughput: 173.03 iter/sec. Timings for 4608K FFT length (4 cores, 4 workers): 24.61, 24.00, 23.96, 23.51 ms. Throughput: 166.57 iter/sec. Timings for 4800K FFT length (4 cores, 1 worker): 6.16 ms. Throughput: 162.33 iter/sec. Timings for 4800K FFT length (4 cores, 4 workers): 24.56, 24.78, 24.18, 24.02 ms. Throughput: 164.06 iter/sec. Timings for 5120K FFT length (4 cores, 1 worker): 6.81 ms. Throughput: 146.90 iter/sec. Timings for 5120K FFT length (4 cores, 4 workers): 27.33, 26.39, 26.15, 25.96 ms. Throughput: 151.23 iter/sec. Timings for 5376K FFT length (4 cores, 1 worker): 7.06 ms. Throughput: 141.55 iter/sec. Timings for 5376K FFT length (4 cores, 4 workers): 29.35, 28.62, 28.16, 28.20 ms. Throughput: 139.97 iter/sec. Timings for 5760K FFT length (4 cores, 1 worker): 7.67 ms. Throughput: 130.29 iter/sec. [Sun Mar 29 19:18:56 2020] Timings for 5760K FFT length (4 cores, 4 workers): 31.20, 30.60, 30.13, 30.14 ms. Throughput: 131.10 iter/sec. Timings for 6144K FFT length (4 cores, 1 worker): 8.59 ms. Throughput: 116.37 iter/sec. Timings for 6144K FFT length (4 cores, 4 workers): 33.18, 33.27, 32.70, 32.32 ms. Throughput: 121.72 iter/sec. Timings for 6400K FFT length (4 cores, 1 worker): 8.38 ms. Throughput: 119.28 iter/sec. Timings for 6400K FFT length (4 cores, 4 workers): 34.66, 34.26, 33.99, 33.72 ms. Throughput: 117.11 iter/sec. Timings for 6720K FFT length (4 cores, 1 worker): 9.01 ms. Throughput: 110.97 iter/sec. Timings for 6720K FFT length (4 cores, 4 workers): 36.54, 36.32, 35.39, 35.57 ms. Throughput: 111.27 iter/sec. Timings for 6912K FFT length (4 cores, 1 worker): 9.47 ms. Throughput: 105.60 iter/sec. Timings for 6912K FFT length (4 cores, 4 workers): 37.08, 36.96, 36.90, 36.56 ms. Throughput: 108.48 iter/sec. Timings for 7168K FFT length (4 cores, 1 worker): 9.49 ms. Throughput: 105.35 iter/sec. Timings for 7168K FFT length (4 cores, 4 workers): 39.29, 39.24, 37.98, 38.03 ms. Throughput: 103.57 iter/sec. Timings for 7680K FFT length (4 cores, 1 worker): 10.01 ms. Throughput: 99.90 iter/sec. Timings for 7680K FFT length (4 cores, 4 workers): 42.06, 40.07, 39.64, 39.48 ms. Throughput: 99.29 iter/sec. Timings for 8064K FFT length (4 cores, 1 worker): 11.01 ms. Throughput: 90.86 iter/sec. Timings for 8064K FFT length (4 cores, 4 workers): 44.00, 44.86, 42.86, 42.76 ms. Throughput: 91.73 iter/sec. Timings for 8192K FFT length (4 cores, 1 worker): 11.02 ms. Throughput: 90.78 iter/sec. Timings for 8192K FFT length (4 cores, 4 workers): 45.76, 46.28, 43.97, 44.50 ms. Throughput: 88.68 iter/sec. 
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