Seby - Ryzen 7 9700X @ 6800MHz - 35sec 902ms GPUPI for CPU - 1B

[Lucky_n00b]

Hi Seby, is it accurate if I assume these Zen 5 was less performant per clock on GPUPI compared to Zen 4? I was getting really bad efficiency and thinking that I might've done something wrong on my setup :/ Thanks ;)

[Seby]

Yes, they are far worse at the same clock as Zen 4. The main thing you did "wrong" was to use AVX512 instruction set instead of AVX2, as for some reason AVX512 is way slower for this benchmark. I just used a version of opencl that didn't have avx512. But yeah better to run this on Zen 4 for sure, also because those are easier to run maybe. This chip needs to be torched to -35 after every crash to be able to run cold temps 🥲. My 7700X just really sucked and couldn't run below -85 at all

Edited August 8 by Seby

[Seby]

Actually I'm especially surprised about avx512 being slower because of how incredibly fast it is for pure avx benchmarks on this generation. Though I did test it before on 12th gen and found the same results, the avx512 on zen 5 is even "bigger".

[Lucky_n00b]

Much thanks! Yeah I've got lots of cold issues on my first LN2 session as well :/

[l0ud_sil3nc3]

2 hours ago, Seby said:

Yes, they are far worse at the same clock as Zen 4. The main thing you did "wrong" was to use AVX512 instruction set instead of AVX2, as for some reason AVX512 is way slower for this benchmark. I just used a version of opencl that didn't have avx512. But yeah better to run this on Zen 4 for sure, also because those are easier to run maybe. This chip needs to be torched to -35 after every crash to be able to run cold temps 🥲. My 7700X just really sucked and couldn't run below -85 at all

Did you try disabling LN2 mode? It's been broken for a minute and depending on what AGESA you're on it might be better (i.e. lower cbb) with it off.

[Seby]

53 minutes ago, l0ud_sil3nc3 said:

Did you try disabling LN2 mode? It's been broken for a minute and depending on what AGESA you're on it might be better (i.e. lower cbb) with it off.

Actually that’s really smart, because I think I remember Bill say that it turns out on its own at -40 or something 🤔🤔🤔

[l0ud_sil3nc3]

9 minutes ago, Seby said:

Actually that’s really smart, because I think I remember Bill say that it turns out on its own at -40 or something 🤔🤔🤔

Yes it's been like this since Zen 3 era iirc correctly, but honestly it should be fixed now. Auto is enabled at LN2 temps and we had that behavior last week when we were there benching but Bill and Amit were able to diagnose and resolve that quickly. Good crew in ATX for sure and AMD is lucky to have them.

The only mission critical thing that needs to be fixed still is unlocked pmic high voltage mode on latest (1.2) AGESA, will join you once that's done