Now there's a wise man......odds on ....IF you have a problem......it will be with a factory clocked card!
I still don't understand why people have become so complacent with ......"It's only running at 80C".... the lower the temp of any component, the longer it will last...........if it crashes at a certain temp range, it might seem to be driver related, but it's not, it's thermal mechanics at work. as metal (copper tracks,legs,wire) heats and cools in a continues cycle, it hardens and becomes more brittle....eventually microscopic breaks can form and with temp expansion can act like a switch....this can be on the PCB itself (Tracks) wires and even inside the chip/s itself........even a few degrees can make a difference to the life of a given bit of kit.........more voltage can fix issues where stability can be gained again going over a perceived stability MAX!.......but volts means heat........extra heat that you have to get rid of.
Aussie Allan