[Libav-user] Faster X265 encoding, buying new hardware, advice please?

[Dave]

Further to my previous email regarding slow x265 encoding on an
older but fast an AMD Phenom II X6 CPU compared to a slower but
newer Intel Core I5, is there anything I need to watch out for when
buying a new CPU?  Are all modern CPUs "equal" in the eyes of
libx265 or is there anything I need to avoid?.

Do I just need to look for number of cores and clock speed up to
my spending limit or do should I be looking for specific features
to optimise x265 encoding?

Are there GPU optimisations to take into account?  It will be
running FreeBSD so CUDA is not really an option (if that's
even relevant here)  If it's significantly worthwhile I could
install a non-GUI Linux and get CUDA libs installed.

Thanks for any advice.