Hmm “recommends” and “optional” make it sound not “required” but in any event, the Wikipedia article on X86-64 says v2 goes back to 2009’s Nehalem microarchitecture.
Hmm “recommends” and “optional” make it sound not “required” but in any event, the Wikipedia article on X86-64 says v2 goes back to 2009’s Nehalem microarchitecture.