The card is a KFA2 GTX 770, when I play games, especially ones heavy in graphics, the card seems to stop working. I'll see the game freeze for a split second, then hear the fans stop on the card, before it kicks back out to desktop. I thought initially it was a driver conflict, but I have since then installed a fresh OS. You can see the large drop just after the dotted line. Card was at 80c. I've taken the card out and put in back in several times, so it's unlikely to be that. Power supply is Corsair HX520W which should be sufficient? Any ideas?