Re: i7 950 heat problem
I've encountered problems with stock Intel heatsinks that look like they're seated fine, but if you push down on the locking mechanism on each of the four contact points, one or more will snap back into place, so what Remeniz is mentioning is spot-on. Definitely make sure they're fitted properly.
Also make sure you don't have any opposing air movements in the case. For best results, make sure your air moves in one direction, and preferably, out the back of the case.