I have a Thermaltake volcano11+ Xaser. heatsink on my 2500XP and Iam overclocked to 2.2Ghz for now. Max temps with Seti@home and Folding@home,and CPU Burnin all 3 running for 8 hours was 43c with the fan set around 3/4 cause at full out the sucker sounds like a hairdryer but it will cool your CPU