(It strikes me that I couldn't find much info here on this subject, or didn't I search enough ?) Anyway with my newly bought XFX8800GTS, after around 10 minutes gaming (e.g. Oblivion) my framerate drops from 50-50fps to 10-15fps. It is definively not a power or heat issue (Zalman 600W psu and 4 case fans, gpu temp around 75-80*C under load) and I have tried all kind of things, including disabling Turbocache and changing some Bios settings, but nothing helps. In other forums I found numerous threads on this subject - apparently many other 8800GTS owners have the same problems - but no solution yet. The only temporary fix seems to be to Alt+Tab out and in the game again, but that solves it only for another 10 minutes or so. So I was curious if anyone here has found a permanent fix already. Or should I go for a complete different card ?