i use p4 2.4ghz prescott..the first time i use it the temperature is 65 degree celcius..the im thinking to buy a new heatsink ..but eventually i checked my proc and clean the old thick thermal paste on it with cotton but and the temperature drop to 47-57 celsius...and after that i clean it with alcohol i finally got a temperature of 57-58.....but if i on the aircon in my room, the temperature is 38.......cool maybe......only using the stock hsf....