Those cores were a bastard child of P54C[0] cores with the beginnings of (though not instruction compatible with) AVX512 + 64bit support (original Pentium had n

Those cores were a bastard child of P54C[0] cores with the beginnings of (though not instruction compatible with) AVX512 + 64bit support (original Pentium had neither of these). They were not like Atom cores at all. The second generation Xeon Phi cores are pretty much based on beefed-up Airmont Atom cores. 0. https://en.wikipedia.org/wiki/P5_%28microarchitecture%29#P54C https://en.wikipedia.org/wiki/P5_%28microarchitecture%29#P54...