Situation 1
CPU: AMD Athalon XP 2500 at 2.2ghz (3200 speed)
MOBO: NF7-S
Cooler: Some crappy generic "stock" HSF
Case: Crappy $20 case with one rear case fan.
Situation: Summer time, no AC in room, gamming, CPU pushed in the high 70's. Eventually the mahcine was cooled via a complex series if internla ducts.
CPU Status: Alive and Kicking, currently running in a machien i built for a friend.
Note of interest: The Geforce Ti4200 in that machine was also hitting high temps, actually burnign out the fan on the HSF. Cooler was replaced, GPU is currently running in my Wifes comp alive and well
Situation 2:
CPU AMD A64 3500 @2.45ghz
MOBO MSI K8N NEO2 Platinum
Cooling: Custom DD water cooling.
Situation, Male molex pin on the pumps lead apparently was loose and not making full contact with the power cable. Must have jostled loose after being moved around for some cleaning and "upgrades". Comp ran and was stable for 5-10 minutes, machine shut down at 80c.
CPU Status: Alive and well, my current processor (this happened about 2 months ago).