My computer is one I put together, and it's great. It runs everything well, but since it's the only one I have, I've been babying it. I try to keep my video card's temperature less than or equal to 50°C, just to make sure it lasts as long as possible. It's a pretty good one (but not great), Sapphire 7850 OC 2GB, and it has a really strong fan. It's currently set to stay at 30% power until it gets to ~50°C (by default), and then ramps up from there. I could put the fan in manual mode and crank it up, but I don't want to wear it out. I've been playing a lot of PCSX2, and I normally run it at 2x native, with max or near max AA and whatnot. Depending on the game, that puts it between 35-45°C, but if I try to put it on 3x native, it shoots up to over 50°C, and then the fan starts doing its magic. Am I being overly cautious? I want good graphics, but I also want system longevity.