I've been having a good number of these using my 770gtx sli system and the oculus rift. I've had them rarely before but they are far more frequent with this set up, playing elite dangerous, using max settings, supersampling, and of course the rift.
Yea I'm basically pounding my graphics cards.
But when looking for info on this, I get something that reminds me of folk medicine to fix it. LOTS of posts online about it, I think toms hardware has a 100 or so, and the "fixes" tend to be uninstall drivers completely, which doesn't work it seems, RMA the card, underclock the card, etc.
I'm curious if anyone knows how to isolate this issue. I haven't seen the cards running over temp.