Hard PC Crash

[Dumbpants]

So, I've been playing the Witcher 3 tonight, I'm super excited about it. Looks amazing so far. But, after the first few hours, my PC had a total crash and power failure, which I then had to remove the power cable, flip the PSU switch on and off, then plug the cable back in, and then turn my computer back on. Everything is fine afterwards, so I start playing the game again. Same crash happens after about 30 minutes. Repeat steps, start playing the game, now crashing is occuring within about 2-5 minutes of playing the game. I've been monitoring temps, and the GPU temps (780 sli) are around 79 C and 72 C when the crash occurs, power percentage at about 89 to 90 percent. CPU temps are cold as ice with my liquid cooler. No overclock on the cards, I've set a power limit on the GPU's within afterburner to 100 %, and then I set temp limit to 79 C. I changed the fan curve to ramp up to 100 % near 60 C. Still after all this, getting the same crashes after around 2-5 minutes.

I've calculated my PSU wattage through various online wattage calculators, even trying to add in extra wattage where I can (and always calculating it at 100 % load), and each time it says my system should be using about 750 W for peak load. I have a Corsair HX 850 PSU, and the wattage calculator sites even suggest an 850 W power supply for me to use for my estimated wattage.

So I just don't get it, does anyone have any ideas or help to offer? Thanks a lot in advance.

[Vypa]

Have you tried reinstalling drivers for your GPU?

Other than that, I'm not too sure what you could do.

[Fluffinator]

Does it blue screen or just go black?

[Dumbpants]

Does it blue screen or just go black?

It goes black, both monitors turn off, the computer's power goes completely off and I have to flush the power to turn it back on. I just reseated both GPU's and my RAM, ran furmark and prime95 for 20-30 minutes, and no crashes. Then I played witcher 3 for 20 minutes and the computer had another power failure. Have no idea what to do

[DEDRICK]

Some Nvidia users are reporting hard crashes, haven't seen any reports from the Red team

[Dumbpants]

Some Nvidia users are reporting hard crashes, haven't seen any reports from the Red team

For real? Ok, because I thought this was just my PSU or some of my hardware. I'm testing my pc with my friend's PSU (same 850W) to see if anything funky will happen still.