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Intel to fuse off AVX512 on Alder Lake silicon going forward


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The AVX512 issue had emerged even before Intel released its new 12th Gen Core CPU series. The company released an optimization guide for its new architecture that initially mentioned AVX512 instruction support, but only on the Performance cores. Intel quickly corrected itself by removing AVX512 support from the guide and later from the CPUs themselves through a microcode update. 

Eventually, most 600-series motherboards received an update, that removed official support for AVX512. Interestingly, though, some companies still tried to offer partial support through hidden BIOS options. Nevertheless, this should change soon, as the updated Alder Lake silicon will no longer have this part of the chip physically enabled.

 

In a short statement to Tom’s Hardware, Intel confirmed that it will now fuse off the instruction from the silicon:

Source 

 

I saw this coming after motherboard manufacturers defied Intel and kept the instruction set alive, at least to some degree.

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Yea, read about this at lunch. I'll be selling off my "Early" sample 12900KF with AVX-512 on ebay in the future. 

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11 minutes ago, Avacado said:

Yea, read about this at lunch. I'll be selling off my "Early" sample 12900KF with AVX-512 on ebay in the future. 

In order to take advantage of your particular sample's "extra" features, the prospective customer will need a motherboard that has never been updated beyond a certain point in time, correct?  Forgive my ignorance, but I am under the impression that "BIOS" files sometimes contain pieces of code that become "permanent" even if the user reverts back to a previous BIOS at a later date.  "Microcode" is the term I see used most frequently in discussions pertaining to these changes.  I do not mean to imply that individuals with access to the requisite tools could not undo these changes, only that it will require more than a thumb drive and internet connection.

TDM

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EHW Review Manager
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3 hours ago, ArchStanton said:

In order to take advantage of your particular sample's "extra" features, the prospective customer will need a motherboard that has never been updated beyond a certain point in time, correct?  Forgive my ignorance, but I am under the impression that "BIOS" files sometimes contain pieces of code that become "permanent" even if the user reverts back to a previous BIOS at a later date.  "Microcode" is the term I see used most frequently in discussions pertaining to these changes.  I do not mean to imply that individuals with access to the requisite tools could not undo these changes, only that it will require more than a thumb drive and internet connection.

Yes, you are correct. @Falkentynehas done some work over on OCN detailing how to roll back microcode to re-enable it. AVX-512 was defaulted to off with E cores enabled in the beginning. 

 

Here is the link:

WWW.OVERCLOCK.NET

 

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