it's anyones guess as to what happened.until he tests a new chip in the mobo, or tests a new mobo
it could've easily been a voltage spike causing something to short circuit on the die itself.
personally i think he fried it by turning it off.
"oh look it's at its thermal limit, better up the voltage"
"oh look the voltages are spiking now i'll turn it off" (rather than backing off when it was 60, lmao that idiot)
turning it off essentially turned off the fans and his heatsink couldn't dissipate that much heat without any airflow=cooked
"i live in a swamp, i put up signs, i'm a terrifying ogre, WHAT DO I HAVE TO DO TO GET A LITTLE BIT OF PRIVACY"