I have the AMD 64 X2 6400+ CPU and the fan I have is your basic aluminum finned block heatsink setup. The temp goes up to 66 c and the system shuts down as set in the bios. I am using a thermal paste. I know it's obvious that I need a better Fan/heatsink but what kind? Space is a premium. Any suggestions. The system is not overclocked. When you play a game is when it gets hot. I was on the net and all worked well.