The last I heard about the number of physical integer registers changing at Intel was the increase from 168 to 180 with Skylake. https://en.wikichip.org/wiki/i

The last I heard about the number of physical integer registers changing at Intel was the increase from 168 to 180 with Skylake. https://en.wikichip.org/wiki/intel/microarchitectures/skylake_(client) https://en.wikichip.org/wiki/intel/microarchitectures/skylak... If you have a source I'm happy to read it but otherwise I think you're confused. Especially about Intel client and server cores having different numbers of registers. The lowest level difference between them I've heard of that wasn't features being fused off is different L3 cache sizes.