I just bought one of those for my P4T-E board, and it wouldn't fit on the processor properly. The retention screws kept it from sitting flush on the processor. Be careful. I decided to put it on my KT7A board and it really is a rock solid heatsink and fan. I have the fan set to medium speed (offers-low,medium,high) and have my 1.33 Ghz processor never going above 39c(full load). Not overclocked right now. Idle is somewhere around 35c36c. Amibient temp in my house is about 71-72. I would really recommend this based on the flexibility of the fan and the performance of the Heatsink. It is also very cool looking. Beware that the Medium fan setting still offers some pretty strong noise.