You can test the video card in another PCIE slot to rule out the slot being the issue.
One thing I am starting wonder about is your PSU. I know it's a nice EVGA Platinum unit, but maybe there is an issue with it, and it's over-volting your GPU. Maybe take a look and make sure the cables are fully seated, and plug them into different VGA ports (your unit has VGA 1-4). I think your unit comes with 4 PCIE connectors (2 x 6 + 2 pin) and (2 x daisy chain), so maybe try using different cables.