New Microcode of Skylake X 50654 fixing AVX2/AVX512 performance penalty is coming soon.

[restsugavan]

According to Intel 02007006 microcode DATE 2023-03-06 for Skylake X SKUs ( CPUID 50654 ) patched on R6E 3801 Official BIOS. The microcode above prevented " DOWNFALL " vulnerable issue attack on " GATHER " instruction of Skylake X Series CPU. ( aka Core i9 78XX-7980XE ).

Even it prevented " DOWNFALL " vulnerable issue efficiently but on other hand it cause side effect of Skylake X CPU performance. Specially FPU units those microcode slow down FMA3/AVX2/AVX512 performance penalty 30-50%. 

Now Intel's engineer had been complete working on these issue.

The new microcode was publish on 2023-07-28. To bring back Skylake X FPU performace. 😁 

[tistou77]

Hi, I saw the new microcode from 2023-07-28 for 50657, but not for 50654 😁

[restsugavan]

SKYLAKE SP CPUID 50653 had new micrococde 01000191 DATE 2023-07-28 to fixing FPU penalty issue ready.

 Skylake SP CPUID 50653 had new micrococde 01000191 DATE 2023-07-28 to fixing FPU penalty ready. Just a moment @tistou77 

[tistou77]

Not available where I get the microcodes 🙂

[PanosXidis24]

why you patched always cpu microcode updates?always hit perfomance

[restsugavan]

I'm Windows Insider.

[Cherry_PL_]

Works fine 😄 Thanks Tistou for implementing it and restsugavan for info about it 👍

[tistou77]

You're welcome 😉

[Int8bldr]

hey tistou77, do you have a modded RAMPAGE VI EXTREME ENCORE BIOS 1601 with the new uCode? Thank you for contribution to the community!

[tistou77]

Hi

Sure 😉

https://drive.google.com/file/d/1rJdGgF_4qrizJGydhu1bGoFAk5bXQhxv/