Some of the design of decisions that lead AVX512 are explained in these slides from Tom Forsyth http://tomforsyth1000.github.io/papers/LRBNI%20origins%20v4%20fu

Some of the design of decisions that lead AVX512 are explained in these slides from Tom Forsyth http://tomforsyth1000.github.io/papers/LRBNI%20origins%20v4%20full%20fat.pdf http://tomforsyth1000.github.io/papers/LRBNI%20origins%20v4%... One of the reasons mentions is 512 bits is the same size as a cache line.