Originally Posted by
SlippyCheeze
The technical answer is: because games are different, and the video card is a big, complex, hot CPU-ish thing, so the way each game uses it differently can cause this problem. That same answer applies to software, driver, and other problems too -- if WoW is the only game that turns on a feature that triggers the problem, then you might only see it in wow.
Other games working fine in equally graphically intensive ways, though, suggests it is less likely to be a hardware issue. OTOH, easy check, yeah? Look at the hardware, make sure it doesn't look failed, and go from there.
(PS: It resembles exactly the heat related failure of NVIDIA GPUs in IBM ThinkPads, and the blown capacitor failure in cards from that bad batch of capacitors back in '08, right down to it mostly showing up in text drawing for who knows what reason.)