Don't... This one was bought on eBay... The CPU too and didn't came with a cooler.
I have to say that before apply thermal compound,when i was removing the heatsink to do it,i didn't notice that one of the 4 pins was a bit stuck yet,so it broke when i forced to got out the heatsink... but i were succeed in fix that pin with universal glue... I dont know if that have something to do with! Cause the Fan is well fixed to the CPU/Board!