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Thanks for sharing your experience. What version of Prime95 are you using? Make sure to use the latest one (v29.8 build 6). The only CPU options I see in the torture test settings are: (1) Disable AVX-512 (grayed out since unsupported on this CPU), (2) Disable AVX2, (3) Disable AVX. There's nothing about FMA3.

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Yeah - I explicitly updated to the latest one; the FMA3 setting is one that existed in prior builds in local.txt so I toggled it off there just to be sure I was hitting an AVX2 code path (in case it didn't mean the UI saying FMA3 in each worker window), but it seems to interpret AVX2 as being synonymous to FMA3 I guess.

same here on 1950x, I built from source, when toggled avx2 it shows "using type-1" I dont know what it is:

https://pastebin.com/tPuYzYC0

Consider trying a couple different versions/builds of prime95

If you look at just the list of issues fixed in v29.x series there is more than one that is close to the code path that is problematic here:

https://www.mersenneforum.org/showpost.php?p=508842&postcoun...

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