Started doing some tests with prime95 64bit and I hit 99C in 20 seconds or so using the bone stock config. Happens even faster if I try to follow the overclocking guides from Tom's, MaximumPC or NCIX. I used Arctic Silver, and I've already re-seated the heatsink twice. Case has 4 fans, plus the one on the heatsink.
Just doesn't make any sense. Please help a guy out......
Even if you had put too much (or even too little) paste it just shouldn't be heating up that quickly to that level. Are you sure the retention mechanism is engaged properly? I've also got to ask... did you remove the little thin piece of plastic that typically comes on the under-side of a heatsink? I totally goofed on my current build... I knew the plastic was there... I read the label that said REMOVE BEFORE INSTALLATION... and it just slipped my mind. Mercifully I caught this before I tried to do anything with my rig, but I can only assume that piece of plastic would have really jacked with my temps.
Removed the plastic, absolutely. I may have used too much paste b/c it's squirting out the edges when I compress the heatsink. Idle temps with stock voltage and clock are 40-41. Seems awfully high at idle, doesn't it?
Is there a chance you manually set the voltage to your processor? I know you said the processor was running at stock speeds, but that really wouldn't matter if you were overvolting the processor. I'd set the motherboard to its default settings just to be on the safe side if you haven't already done that.