Hello, I've a MSI NX6600GT VTD128 After intensive usage of my card, with good new cooling (Zalmann VF750-Cu), I get max temp of 54 C° for the GPU... I recently fitted the heatsink onto the RAM chips (with some job for it, because they need to be "personalized" for AGP 6600 GT... So after a while in some few games (especially GuildWars, wich is one of the most heat generator I know actually), I get curious bug like only a half of the texture's showing and serious drop of FPS. If I do 360° lookup around generally solve it but after this happens, few minutes, I get complete blue... grey ... screen, depend. Coming back to Desktop then to the game solve the issue up for another hour. But note that one time in WOW in the past week, I got inversed image... never happened before... And today I get same problem in guildwars after trouble just discribed upward... I got back to the desktop... but in 640x480 and 4 bits color depth. I tried to change settings but no more nVidia control panel. Needed to logout, log with another account then log back in with the original one to get normal desktop options and nVidia Control Panel back. Do you think it's a driver's bug, (got this with 71.84 Officials WHQL AND 71.90 Unofficials WHQL), GPU overheating (53 °C isn't that high), Graphic RAM (DDR900) overheat or HSI unit overheat. Thanks.