Re: AVX512 -- Available on exactly which Intel processors?......
There's a website you can use to find out the answer to questions just like that, it is called Google.
While you digest that mid-shattering nugget of information:
Proposed by Intel in July 2013, and implemented in Intel's Xeon Phi x200 (Knights Landing) and Skylake-X CPUs; this includes the Core-X series (excluding the Core i5-7640X and Core i7-7740X), as well as the new Xeon Scalable Processor Family and Xeon D-2100 Embedded Series.
https://en.wikipedia.org/wiki/AVX-512#CPUs_with_AVX-512