I have one of those processors. Every once in a while it gets extremely hot locking up whatever I happen to be working on or very close to locking up. Go into the BIOS and set the auto heat thing to it's lowest ( 140-160c ) and see if the computer shuts down. Also when having problems shut down as fast as possible and see where the temp is in the BIOS. Granted it'll drop really quickly but you should get there fast enough to see "abnormal" temps. I'm in the process of trying to work out a solution with heat sinks. Corsair H50 is useless as are a couple of "regular" after market heat sinks and fans. Perhaps there's an undisclosed problem with these processors ????
I've looked at the heat after a crash before, and it is always somewhere around 50c. Is there any way to test if it is the power supply without buying a new one? Also, is there a certain CPU temp that the CPU will reach where the computer will automatically shut off?