I tried it on my first cpu (1.1tbird) and i just could not get it even on the core. I ended it scratching it and the fan (alpha)(I hate this fan, very hard to get on)). I just don't want to risk it. I am thinking of buying the silver mountain HSF and would like to know if this should be sufficient. If I OC, It wont be much. I have a 1333, and I might try to get 1400 or maybe 1500 while staying at 45c under load.