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I'm having the same issue...pretty disconcerting to get a hard reboot ever out of a game application.

i7 960 3.2ghz
gtx 970
850w+ power supply
Haven't encountered this reset thing yet but I suggest opening up your pc case to help with the cooling if you are using stock gpu coolers.

Also may I suggest that you install the latest geforce drivers if you haven't done so.
heybarba: Apparently 30 fps cap solve the issue here, but I don't buy a 970 to play at 30 fps ¬¬
Will try the fan trick
As an alternative to the fan trick, I've also found that underclocking the card by 100MHz on GPU and mem speeds (with EVGA Precision X) fixed the problem. I didn't see a noticeable performance drop btw, and to me it's a better solution than all that extra fan noise.

So it's not overheating as such that's causing it (the card was only running 2 degrees cooler with the underclock) as I previously thought, more that the factory overclock isn't stable under the extreme loads this game causes.
Post edited May 21, 2015 by simon_brown75