Hi all, I currently have a AMD anthlon 64x2 Dual Core Processor 4200+ 2.21GHz. I am going to upgrade to 4GB DDR from 2GB. By looking at the site at the bottom I have two options for upgrading; AMD Athlon 64 FX FX-62 2.8GHz. or AMD Athlon 64 X2 5000+ 2.6GHz as taken from cpu-upgrade.com which shows you all compatible CPU's for each monthboard. can anyone give me any advice as to which one is best? will i need another fan?