My previous video card was showing the normal graphical signs of impending failure, so I decided to buy an 8GB XFX RX480. Then I RMA'd it within a week because it couldn't handle running two instances of FFXI and would either "Display Driver" crash or would bluescreen me. While deciding to RMA it, I tried:
* Updating my BIOS to the most recent version
* Trying the previous 5 versions of the AMD driver suite.
* Tried using Furmark to as a graphics stress test to see if the temp went substantially above its working temp of 80C (it didn't).
Eventually I did decide it was a hardware problem and RMA'd it for a replacement. Meanwhile, I put back in my old Radeon HD6780, which resumed doing work despite graphical artifacts.
Two days ago the replacement arrived and I uninstalled my previous drivers, installed the RX480 card, installed the newest drivers, etc. First, I tested it with Furmark and it had no problems. Then I loaded two copies of FFXI and Netflix. Fine at first, temps still looked fine. I left the two instances of FFXI on overnight. Came back today and woke up my computer, still no problem. Started typing... blue screen, VIDEO_TDR_FAILURE.
What the fuck could it be?