One relevant thing to check with older hardware: https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2/646289#646289 https

One relevant thing to check with older hardware: https://unix.stackexchange.com/questions/631217/how-do-i-check-if-my-cpu-supports-x86-64-v2/646289#646289 https://unix.stackexchange.com/questions/631217/how-do-i-che... https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels https://en.wikipedia.org/wiki/X86-64#Microarchitecture_level...