I have a 3500+ Newcastle 939 at the moment which is clocked to 2.7ghz (from 2.2ghz) so is about FX-55 speed now (so SISandra says). Is it worth me getting a 4000+ San Diego or a 4000 X2 dual core. I personally don't think it's worth upgrading as i can still get more out of my cpu and reckon i could get 2.8ghz and it'd be costly to upgrade, so, seriously, is it actually worth upgrading? IE will i see a significant rise in performance?