- Mar 7, 2008
Ok Mack, tried it out, not sure if this is exactly what you want. Did 128K min/max first test was 5 seconds and ran around 4.0 GHz second set is 30 seconds 1 core 4100 all cores dropped to 3.7 during the complex test
Thanks. That's sufficient to answer the biggest question I had, which is, does the AVX-512 implementation improve the Prime95 IPC when not limited by other factors e.g. ram bandwidth.
The answer is yes. I'm not at home at the moment but I just did a comparison on my 7300HQ which scores around 8100 with 4 cores at 3.1 GHz. 128k FFT is small enough to run one per core so practically unlimited in performance. Normalise clocks and cores, and Rocket Lake comes out about 50% faster than Kaby Lake (and other Skylake architecture CPUs by association). I can run it against Skylake-X when I'm home again as a check. This makes it interesting enough I'll definitely buy my own sample to use once I'm home again.
Ideally we'd see up to 2x perf, but there could be many reasons (including Prime95 itself) why we don't see that, hence wanting to check on Skylake-X as another direct AVX-512 comparison point.