20200325, 16:59  #793  
"Kieren"
Jul 2011
In My Own Galaxy!
97·103 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^{2}·7 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
7147_{10} Posts 

20200326, 01:51  #796 
Jun 2003
13·19^{2} Posts 

20200326, 02:25  #797 
"Curtis"
Feb 2005
Riverside, CA
2^{2}·3·359 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
7·1,021 Posts 

20200326, 03:40  #799 
Jun 2003
1255_{16} 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"
Jul 2011
In My Own Galaxy!
9991_{10} 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
3^{2}×103 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. 
20200501, 01:34  #802 
Apr 2020
1_{2} Posts 
This is from my first computer build in 10 years.
Corsair Carbide 275R AMD Ryzen 9 3950X (stock, PBO at auto) Asrock Taichi X570 Noctua NHD15 2x8GB Corsair Vengeance LPX 3600 PNY nVidia Quadro K1200 512GB Samsung 970Pro Nvme SSD Do my results seem... a little slow? ThroughputTest: Code:
AMD Ryzen 9 3950X 16Core Processor CPU speed: 4274.04 MHz, 16 hyperthreaded cores CPU features: 3DNow! Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA L1 cache size: 16x32 KB, L2 cache size: 16x512 KB, L3 cache size: 4x16 MB L1 cache line size: 64 bytes, L2 cache line size: 64 bytes Machine topology as determined by hwloc library: Machine#0 (total=14009328KB, Backend=Windows, hwlocVersion=2.0.4, ProcessName=prime95.exe) Package (total=14009328KB, CPUVendor=AuthenticAMD, CPUFamilyNumber=23, CPUModelNumber=113, CPUModel="AMD Ryzen 9 3950X 16Core Processor ", CPUStepping=0) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000003) PU#0 (cpuset: 0x00000001) PU#1 (cpuset: 0x00000002) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000000c) PU#2 (cpuset: 0x00000004) PU#3 (cpuset: 0x00000008) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000030) PU#4 (cpuset: 0x00000010) PU#5 (cpuset: 0x00000020) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000000c0) PU#6 (cpuset: 0x00000040) PU#7 (cpuset: 0x00000080) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000300) PU#8 (cpuset: 0x00000100) PU#9 (cpuset: 0x00000200) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000c00) PU#10 (cpuset: 0x00000400) PU#11 (cpuset: 0x00000800) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00003000) PU#12 (cpuset: 0x00001000) PU#13 (cpuset: 0x00002000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000c000) PU#14 (cpuset: 0x00004000) PU#15 (cpuset: 0x00008000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00030000) PU#16 (cpuset: 0x00010000) PU#17 (cpuset: 0x00020000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000c0000) PU#18 (cpuset: 0x00040000) PU#19 (cpuset: 0x00080000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00300000) PU#20 (cpuset: 0x00100000) PU#21 (cpuset: 0x00200000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00c00000) PU#22 (cpuset: 0x00400000) PU#23 (cpuset: 0x00800000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x03000000) PU#24 (cpuset: 0x01000000) PU#25 (cpuset: 0x02000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0c000000) PU#26 (cpuset: 0x04000000) PU#27 (cpuset: 0x08000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x30000000) PU#28 (cpuset: 0x10000000) PU#29 (cpuset: 0x20000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0xc0000000) PU#30 (cpuset: 0x40000000) PU#31 (cpuset: 0x80000000) Prime95 64bit version 29.8, RdtscTiming=1 Timings for 2048K FFT length (16 cores, 1 worker): 1.29 ms. Throughput: 777.85 iter/sec. Timings for 2048K FFT length (16 cores, 2 workers): 1.23, 1.23 ms. Throughput: 1621.36 iter/sec. Timings for 2240K FFT length (16 cores, 1 worker): 1.18 ms. Throughput: 847.91 iter/sec. Timings for 2240K FFT length (16 cores, 2 workers): 1.53, 1.54 ms. Throughput: 1302.56 iter/sec. Timings for 2304K FFT length (16 cores, 1 worker): 1.21 ms. Throughput: 828.81 iter/sec. Timings for 2304K FFT length (16 cores, 2 workers): 1.64, 1.64 ms. Throughput: 1222.46 iter/sec. Timings for 2400K FFT length (16 cores, 1 worker): 1.25 ms. Throughput: 800.44 iter/sec. Timings for 2400K FFT length (16 cores, 2 workers): 1.74, 1.66 ms. Throughput: 1177.02 iter/sec. Timings for 2560K FFT length (16 cores, 1 worker): 1.33 ms. Throughput: 752.11 iter/sec. Timings for 2560K FFT length (16 cores, 2 workers): 1.87, 1.87 ms. Throughput: 1071.72 iter/sec. Timings for 2688K FFT length (16 cores, 1 worker): 1.39 ms. Throughput: 718.46 iter/sec. Timings for 2688K FFT length (16 cores, 2 workers): 2.03, 2.01 ms. Throughput: 989.08 iter/sec. Timings for 2800K FFT length (16 cores, 1 worker): 1.59 ms. Throughput: 628.76 iter/sec. Timings for 2800K FFT length (16 cores, 2 workers): 2.24, 2.59 ms. Throughput: 832.53 iter/sec. Timings for 2880K FFT length (16 cores, 1 worker): 1.49 ms. Throughput: 672.83 iter/sec. Timings for 2880K FFT length (16 cores, 2 workers): 2.58, 2.60 ms. Throughput: 773.22 iter/sec. Timings for 3072K FFT length (16 cores, 1 worker): 1.47 ms. Throughput: 682.13 iter/sec. Timings for 3072K FFT length (16 cores, 2 workers): 2.49, 2.48 ms. Throughput: 804.90 iter/sec. Timings for 3200K FFT length (16 cores, 1 worker): 1.67 ms. Throughput: 599.22 iter/sec. Timings for 3200K FFT length (16 cores, 2 workers): 2.97, 2.90 ms. Throughput: 681.67 iter/sec. Timings for 3360K FFT length (16 cores, 1 worker): 1.71 ms. Throughput: 583.36 iter/sec. Timings for 3360K FFT length (16 cores, 2 workers): 3.62, 3.43 ms. Throughput: 568.04 iter/sec. Timings for 3584K FFT length (16 cores, 1 worker): 1.70 ms. Throughput: 588.05 iter/sec. Timings for 3584K FFT length (16 cores, 2 workers): 3.98, 3.78 ms. Throughput: 515.97 iter/sec. Timings for 3840K FFT length (16 cores, 1 worker): 1.96 ms. Throughput: 509.35 iter/sec. Timings for 3840K FFT length (16 cores, 2 workers): 5.25, 4.95 ms. Throughput: 392.56 iter/sec. Timings for 4096K FFT length (16 cores, 1 worker): 1.96 ms. Throughput: 511.07 iter/sec. Timings for 4096K FFT length (16 cores, 2 workers): 6.40, 6.07 ms. Throughput: 320.83 iter/sec. Timings for 4480K FFT length (16 cores, 1 worker): 2.03 ms. Throughput: 491.95 iter/sec. Timings for 4480K FFT length (16 cores, 2 workers): 8.61, 8.39 ms. Throughput: 235.38 iter/sec. Timings for 4608K FFT length (16 cores, 1 worker): 2.40 ms. Throughput: 417.09 iter/sec. Timings for 4608K FFT length (16 cores, 2 workers): 8.90, 8.42 ms. Throughput: 231.20 iter/sec. Timings for 4800K FFT length (16 cores, 1 worker): 2.52 ms. Throughput: 397.12 iter/sec. Timings for 4800K FFT length (16 cores, 2 workers): 9.87, 9.45 ms. Throughput: 207.23 iter/sec. Timings for 5120K FFT length (16 cores, 1 worker): 2.78 ms. Throughput: 360.14 iter/sec. Timings for 5120K FFT length (16 cores, 2 workers): 11.35, 10.97 ms. Throughput: 179.23 iter/sec. Timings for 5376K FFT length (16 cores, 1 worker): 3.09 ms. Throughput: 323.57 iter/sec. Timings for 5376K FFT length (16 cores, 2 workers): 12.87, 12.43 ms. Throughput: 158.21 iter/sec. Timings for 5600K FFT length (16 cores, 1 worker): 2.84 ms. Throughput: 351.59 iter/sec. Timings for 5600K FFT length (16 cores, 2 workers): 14.04, 13.75 ms. Throughput: 143.92 iter/sec. Timings for 5760K FFT length (16 cores, 1 worker): 3.13 ms. Throughput: 319.21 iter/sec. Timings for 5760K FFT length (16 cores, 2 workers): 15.20, 14.78 ms. Throughput: 133.49 iter/sec. Timings for 6144K FFT length (16 cores, 1 worker): 3.73 ms. Throughput: 268.08 iter/sec. Timings for 6144K FFT length (16 cores, 2 workers): 15.93, 15.54 ms. Throughput: 127.15 iter/sec. Timings for 6400K FFT length (16 cores, 1 worker): 3.93 ms. Throughput: 254.14 iter/sec. Timings for 6400K FFT length (16 cores, 2 workers): 17.56, 17.01 ms. Throughput: 115.74 iter/sec. Timings for 6720K FFT length (16 cores, 1 worker): 4.36 ms. Throughput: 229.36 iter/sec. Timings for 6720K FFT length (16 cores, 2 workers): 18.74, 18.20 ms. Throughput: 108.29 iter/sec. Timings for 7168K FFT length (16 cores, 1 worker): 5.18 ms. Throughput: 193.11 iter/sec. Timings for 7168K FFT length (16 cores, 2 workers): 20.08, 19.65 ms. Throughput: 100.69 iter/sec. Timings for 7680K FFT length (16 cores, 1 worker): 6.66 ms. Throughput: 150.18 iter/sec. Timings for 7680K FFT length (16 cores, 2 workers): 22.89, 22.23 ms. Throughput: 88.68 iter/sec. Timings for 8000K FFT length (16 cores, 1 worker): 6.70 ms. Throughput: 149.21 iter/sec. Timings for 8000K FFT length (16 cores, 2 workers): 23.89, 23.05 ms. Throughput: 85.26 iter/sec. Timings for 8064K FFT length (16 cores, 1 worker): 6.98 ms. Throughput: 143.28 iter/sec. Timings for 8064K FFT length (16 cores, 2 workers): 24.07, 23.54 ms. Throughput: 84.02 iter/sec. Timings for 8192K FFT length (16 cores, 1 worker): 7.22 ms. Throughput: 138.45 iter/sec. Timings for 8192K FFT length (16 cores, 2 workers): 23.60, 23.62 ms. Throughput: 84.72 iter/sec. Code:
AMD Ryzen 9 3950X 16Core Processor CPU speed: 4297.50 MHz, 16 hyperthreaded cores CPU features: 3DNow! Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA L1 cache size: 16x32 KB, L2 cache size: 16x512 KB, L3 cache size: 4x16 MB L1 cache line size: 64 bytes, L2 cache line size: 64 bytes Machine topology as determined by hwloc library: Machine#0 (total=14009328KB, Backend=Windows, hwlocVersion=2.0.4, ProcessName=prime95.exe) Package (total=14009328KB, CPUVendor=AuthenticAMD, CPUFamilyNumber=23, CPUModelNumber=113, CPUModel="AMD Ryzen 9 3950X 16Core Processor ", CPUStepping=0) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000003) PU#0 (cpuset: 0x00000001) PU#1 (cpuset: 0x00000002) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000000c) PU#2 (cpuset: 0x00000004) PU#3 (cpuset: 0x00000008) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000030) PU#4 (cpuset: 0x00000010) PU#5 (cpuset: 0x00000020) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000000c0) PU#6 (cpuset: 0x00000040) PU#7 (cpuset: 0x00000080) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000300) PU#8 (cpuset: 0x00000100) PU#9 (cpuset: 0x00000200) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000c00) PU#10 (cpuset: 0x00000400) PU#11 (cpuset: 0x00000800) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00003000) PU#12 (cpuset: 0x00001000) PU#13 (cpuset: 0x00002000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000c000) PU#14 (cpuset: 0x00004000) PU#15 (cpuset: 0x00008000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00030000) PU#16 (cpuset: 0x00010000) PU#17 (cpuset: 0x00020000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000c0000) PU#18 (cpuset: 0x00040000) PU#19 (cpuset: 0x00080000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00300000) PU#20 (cpuset: 0x00100000) PU#21 (cpuset: 0x00200000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00c00000) PU#22 (cpuset: 0x00400000) PU#23 (cpuset: 0x00800000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x03000000) PU#24 (cpuset: 0x01000000) PU#25 (cpuset: 0x02000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0c000000) PU#26 (cpuset: 0x04000000) PU#27 (cpuset: 0x08000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x30000000) PU#28 (cpuset: 0x10000000) PU#29 (cpuset: 0x20000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0xc0000000) PU#30 (cpuset: 0x40000000) PU#31 (cpuset: 0x80000000) Prime95 64bit version 29.8, RdtscTiming=1 Timing FFTs using 16 threads on 16 cores. Best time for 2048K FFT length: 1.152 ms., avg: 1.176 ms. Best time for 2240K FFT length: 1.193 ms., avg: 1.223 ms. Best time for 2304K FFT length: 1.196 ms., avg: 1.215 ms. Best time for 2400K FFT length: 1.274 ms., avg: 1.288 ms. Best time for 2560K FFT length: 1.357 ms., avg: 1.389 ms. Best time for 2688K FFT length: 1.392 ms., avg: 1.409 ms. Best time for 2800K FFT length: 1.578 ms., avg: 1.600 ms. Best time for 2880K FFT length: 1.488 ms., avg: 1.510 ms. Best time for 3072K FFT length: 1.466 ms., avg: 1.480 ms. Best time for 3200K FFT length: 1.640 ms., avg: 1.664 ms. Best time for 3360K FFT length: 1.720 ms., avg: 1.737 ms. Best time for 3584K FFT length: 1.704 ms., avg: 1.734 ms. Best time for 3840K FFT length: 1.913 ms., avg: 1.942 ms. Best time for 4096K FFT length: 1.915 ms., avg: 1.959 ms. Best time for 4480K FFT length: 1.954 ms., avg: 1.992 ms. Best time for 4608K FFT length: 2.290 ms., avg: 2.330 ms. Best time for 4800K FFT length: 2.382 ms., avg: 2.479 ms. Best time for 5120K FFT length: 2.639 ms., avg: 2.734 ms. Best time for 5376K FFT length: 2.856 ms., avg: 3.057 ms. Best time for 5600K FFT length: 2.747 ms., avg: 2.885 ms. Best time for 5760K FFT length: 2.965 ms., avg: 3.059 ms. Best time for 6144K FFT length: 3.477 ms., avg: 3.746 ms. Best time for 6400K FFT length: 3.589 ms., avg: 3.834 ms. Best time for 6720K FFT length: 4.012 ms., avg: 4.177 ms. Best time for 7168K FFT length: 4.820 ms., avg: 5.011 ms. Best time for 7680K FFT length: 6.110 ms., avg: 6.286 ms. Best time for 8000K FFT length: 6.301 ms., avg: 6.461 ms. Best time for 8064K FFT length: 6.630 ms., avg: 6.760 ms. Best time for 8192K FFT length: 6.941 ms., avg: 7.102 ms. Code:
AMD Ryzen 9 3950X 16Core Processor CPU speed: 4278.18 MHz, 16 hyperthreaded cores CPU features: 3DNow! Prefetch, SSE, SSE2, SSE4, AVX, AVX2, FMA L1 cache size: 16x32 KB, L2 cache size: 16x512 KB, L3 cache size: 4x16 MB L1 cache line size: 64 bytes, L2 cache line size: 64 bytes Machine topology as determined by hwloc library: Machine#0 (total=14009328KB, Backend=Windows, hwlocVersion=2.0.4, ProcessName=prime95.exe) Package (total=14009328KB, CPUVendor=AuthenticAMD, CPUFamilyNumber=23, CPUModelNumber=113, CPUModel="AMD Ryzen 9 3950X 16Core Processor ", CPUStepping=0) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000003) PU#0 (cpuset: 0x00000001) PU#1 (cpuset: 0x00000002) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000000c) PU#2 (cpuset: 0x00000004) PU#3 (cpuset: 0x00000008) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000030) PU#4 (cpuset: 0x00000010) PU#5 (cpuset: 0x00000020) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000000c0) PU#6 (cpuset: 0x00000040) PU#7 (cpuset: 0x00000080) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000300) PU#8 (cpuset: 0x00000100) PU#9 (cpuset: 0x00000200) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00000c00) PU#10 (cpuset: 0x00000400) PU#11 (cpuset: 0x00000800) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00003000) PU#12 (cpuset: 0x00001000) PU#13 (cpuset: 0x00002000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0000c000) PU#14 (cpuset: 0x00004000) PU#15 (cpuset: 0x00008000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00030000) PU#16 (cpuset: 0x00010000) PU#17 (cpuset: 0x00020000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x000c0000) PU#18 (cpuset: 0x00040000) PU#19 (cpuset: 0x00080000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00300000) PU#20 (cpuset: 0x00100000) PU#21 (cpuset: 0x00200000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x00c00000) PU#22 (cpuset: 0x00400000) PU#23 (cpuset: 0x00800000) L3 (size=16384KB, linesize=64, ways=16, Inclusive=0) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x03000000) PU#24 (cpuset: 0x01000000) PU#25 (cpuset: 0x02000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x0c000000) PU#26 (cpuset: 0x04000000) PU#27 (cpuset: 0x08000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0x30000000) PU#28 (cpuset: 0x10000000) PU#29 (cpuset: 0x20000000) L2 (size=512KB, linesize=64, ways=8, Inclusive=1) L1d (size=32KB, linesize=64, ways=8, Inclusive=0) Core (cpuset: 0xc0000000) PU#30 (cpuset: 0x40000000) PU#31 (cpuset: 0x80000000) Prime95 64bit version 29.8, RdtscTiming=1 Best time for 61 bit trial factors: 0.714 ms. Best time for 62 bit trial factors: 0.730 ms. Best time for 63 bit trial factors: 0.717 ms. Best time for 64 bit trial factors: 0.719 ms. Best time for 65 bit trial factors: 0.711 ms. Best time for 66 bit trial factors: 0.698 ms. Best time for 67 bit trial factors: 0.695 ms. Best time for 75 bit trial factors: 0.692 ms. Best time for 76 bit trial factors: 0.697 ms. Best time for 77 bit trial factors: 0.697 ms. 
20200501, 22:38  #803 
"/X\(‘‘)/X\"
Jan 2013
B25_{16} Posts 
Your 1 worker results are far faster than your 2 worker results. I'd run only a single worker after seeing your results.
The higher core count Ryzen and Threadripper parts are very memory bandwidth starved for Prime95 (same with Intel parts). You might get a little more performance with dual rank memory, or four sticks of memory. I'd be curious to see how 1 worker with 6, 7, and 8 cores performs. The sweet spot for the available memory bandwidth is probably around 7 or 8 cores. 
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