Don't know about other OS's, but on Win64 I'm getting better results on my FX-8120 (hpm of ~30) versus 21 on my newer i7 3820 system! These are hpms are on bytemaster's pool, I was getting roughly half that on each system before, so the AMD was performing better even then (but I had to run 2 separate protoshares to get the full hpms on the AMD since it's got 8 logical cores). But with the new pool mining, only running 1 process and only taking up a bit over a 1GB.