I think I've found a happy spot to settle with as far as OC'ing my card goes. Tomb Raider 2013's one of the few games that made my 670 run hot, and it's no different here. With the contact shadows and TressFX on, it uses a constant 99% of my GPU, and gets up to 80 degrees. I always play with vsync on and with a global framerate cap of 60fps, so I don't think it'll ever get that hot, but it seems pretty stable for now.