No, i did no overclocking , just poped in in normaly. It would run fine using the standered driver from Xp. I have a Case Fan Blowing on it to, so I would think that overheating would'nt be a issue. I tried to Use the ATI catalyst driver, instead; of the regular driver but after i installed it when the computer restarted a error message came up that said Application Failed to initialize properly Erroe: 0xc0000135. Right now i have a radeon 7500 in until i get a new 9800 pro. I downloaded the catalyst to try on the 7500 and no error message came up. it ran fine, except that sometimes when i started my computer the screen looked like when you would try to put a old nintendo game in the original 8 bit nintendo system, wierd shapes and colors and blocks and not being able to see the screen. Once i put put the normal driver in it stoped doing it.