Nvidia GTX980, computer crashes with no BSOD (both DX11 and 9)

[Raist]

At the very least undo your overclocks. You may already be in the realm of a 400 watt draw on a reasonable load, depending on what all else is pulling power. Start thrashing the drive, hammering the RAM, ramping up the GPU to full voltage and hammering it's memory, and thrashing the CPU to push past it's stock TDP rating may well push it to 435+ at times the way this game hits everything so hard at once.

Even though it is an 80+ model, it can still put a good bit of ambient heat in the case when you are riding it too close to peak output...and that can cause issues with some components you may not be monitoring like RAM, mboard power regulation, or assorted other components.

Your 12v rail(s) might also be getting tapped out as well. Should double check there is enough capacity for what you are running on that spec.---if you come up short on that rail, you are in for trouble...if not now, down the road as you wear down key components faster.