I've got an XFX 6800ultra card and up until now it's been great. But now today I see that straight after startup the card is running at 67°C, and if I try play anything it goes over the 115°C threshold, causing it to slow itself down and makes my games either slow down, hang, or crash. I've got a rather small case, so ventilation isn't superb, but it never used to run this high before. It's not overclocked (never has been). Any suggestions? I really don't have the money to replace this thing.