My CPU temps seem to be impossibly high - reading between 87 and 99 C. Is this even possible? The air coming out of the back of the case actually feels quite cool. I opened the case and the heat sink seems to be seated properly on the chip. The BIOS seems to also have automatically set the CPU ratio back to 6x (i believe i had it set at 9x), and my chip is only reading as 2GHz (its a 3GHz chip) when it starts up. I noticed another poster had a similar problem - but it was a improperly seated heat sink. I think mine is on there correctly...
It sounds like you are having the exact same problem I had. I thought the heatsink was seated properly too. I realized its really important to push down the pins opposite each other. Before, I went in a circle and even though it seemed like it was seated correctly, when I pulled it off, only half of the thermal compound was smooshed.
I would take off the heatsink and then put it back on, maybe with some arctic silver instead. I just got some, though I don't think its necessary because mine is running fine now.