> Additionally, 512-bit wide vectors are just too big - the resulting vector units take up too much die space even on big cores, and the power consumption causes issues causing said dies to downclock.

This is no longer true, citing [0]:

> At least, it means we need to adjust our mental model of the frequency related cost of AVX-512 instructions. Rather than the prior-generation verdict of “AVX-512 generally causes significant downclocking”, on these Ice Lake and Rocket Lake client chips we can say that AVX-512 causes insignificant (usually, none at all) license-based downclocking and I expect this to be true on other ICL and RKL client chips as well.

And we still have to see AMDs implementation of AVX512 on Zen4 to know what behavior and limits it may have (if any).

[0] https://travisdowns.github.io/blog/2020/08/19/icl-avx512-fre...