It's interesting but it was 5 GHz, not very practical. My i9-9940x slows from 4.3 GHz (all cores) to 3.5 when running AVX512.

I've been trying to vectorize verthash and AVX512 is slower than AVX2. I presume the significantly lower clock rate
slows down data file access, negating any gains from code optimization.
I also presume eth would have the same issues with the DAG.

I'm also not aware of any usable CPU miners for Eth.