I'm not so sure about that, I think chips can only take so many volts. I've seen a video of a cpu being overclocked with liquid nitrogen and the cpu became unstable after a while and that was like -273 C. However, the heat definably has a huge impact on how far you can overclock it, but I'm sticking to my guns in that if you raise the volts on anything it won't last as long. Besides, once you have to raise volts you won't be getting too much further anyway. So basically, if you want to keep that card for a while don't raise the volts!