I remember a paper on a close subject - "Revealing hidden services by their clock skew" [1] tl;dr: performing operations on the hidden Tor nodes causes CPU heating, which causes OS clock drift due changing CPU clock circuit properties.

As for AVX512, I'm not sure - IIRC the Intel CPUs throttle (or lower frequency) automatically around the AVX512 execution for TDP reasons.

[1] https://news.ycombinator.com/item?id=7694612