Windows 11’s first update makes AMD CPU performance even worse

Re:Windows 11’s first update makes AMD CPU performance even ... by localhost on Wednesday October 13, 2021 @11:46AM (#28853676)

Thank you for the excellent summary here. You should have written the tl;dr for the Windows team even though I know that officially saying this would likely piss off just as many people.

One follow-on question - any insights into how what you wrote above explains why Microsoft dropped support for AMD Zen in Win11 (Zen+ and higher are only supported)? Looking at Wikichip, it doesn't seem like there's a feature missing, so perhaps there's an unfixable bug in Zen?

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Re:Windows 11’s first update makes AMD CPU performance even ... by Macha on Wednesday October 13, 2021 @12:23PM (#28854190)

Isn't RDRAND broken in Zen1? (I think it was broken on launch in zen2 and zen3 also but they patched it in agesa updates)

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Re:Windows 11’s first update makes AMD CPU performance even ... by localhost on Wednesday October 13, 2021 @06:04PM (#28858238)

I don't know if that's the case, but wouldn't that be a strange reason to withhold a Windows release from it?

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Re:Windows 11’s first update makes AMD CPU performance even ... by astrange on Thursday October 14, 2021 @12:46AM (#28860614)

If nobody uses Zen1 then it's worth dropping just so you don't have to test it.

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