Quote Originally Posted by lonerider View Post
I had it overclocked to 4.4Ghz stable for about a month, then my friend started telling me that most of his games would lock up (SC2, WoW) after 10-20 minutes randomly of continued gameplay. So I checked his temps and they were a bit high... I had it throttled down to 4Ghz and it went stable again (till this day, no more complaints).
I've had that happen a few times. Every case was either a bubble in the thermal paste or just a bad batch of paste that "dried out" under heavy use. It's common enough that it's now the first thing I check when I have those kinds of problems.