yea if ur running a 775 on that heatsink which i think was origionally designed for a 478 then no wonder, i am using thermal grease thats "comp usa" brand and i got temps at 100 so i'm not 2 worried about temps. just make sure u get something with alot of airflow and to spread the thermal paste across the surface of the heatsink's copper or silver part, whereever the heatsink touches the processor itself and u ought 2 be fine. but i mean i'm using a stock fan for my 3.0 p4 and it's fine, just looks different.