[ivegotnoaccount]

Isn't it on their consumer lines only that Intel removed AVX-512?

Saphire Rapids is indicated as having support for it.

I know that even though you pointed to an EPYC CPU, all Zen4 support it, but Intel probably released it more for the professional users than their non-pro ones.

[WJW]

Yes it's only the Alder Lake (ie cheaper, consumer oriented CPUs) in which it has been removed. Server chips still have it AFAIK.

Even on Alder Lake, the official explanation is that it has both P(erformance) and E(fficiency) cores, with the E cores being significantly more power efficient and the P cores being significantly faster. The P cores have AVX512, the E cores don't. Since most kernels have no idea that this is a thing and treat all CPUs in a system as equal, they will happily schedule code with AVX512 instructions on an E core. This obviously crashes, since the CPU doesn't know how to handle those instructions. Some motherboard manufacturers allowed you to work around this by simply turning off all the E-cores, so only the P-cores (with AVX512 support) remained. Intel was not a fan of this and eventually disabled AVX512 in hardware.

As ivegotnoaccount mentioned, the Sapphire Rapids range of CPUs will have AVX512. Those are not intended for the typical consumer or mobile platform though, but for servers and big workstations where power consumption is much less of a concern. You would probably not want such a chip in your laptop or phone.

[pantalaimon]

It would have been possible to devise a system call to 'unlock' AVX512 for an application that wants to use it, which would pin it to only be scheduled on P cores.