the CPU OC is stable i ran prime for 2 hours without problems and my computer was 24/7 on since 3 months now, i dont suspect the vga because it freezed without vga driver on low rez, also i managed to play bioshock normally for 1 hour just when i closed it and opened firefox i started downloaing a file calling flashget, once flashget opened the screen freezed (this happened twice with flashget) the problem is i cant see any error in the event viewer. also it did freeze on batman. i tried shift it s working fine i stressed the vga with fur and lightmarks 3d mark , working fine, i disabled startup programs, could it be vista, should i format and reinstall?