me i had that problem too i did research ..and some Hitech was saying the card stronger so not get use and Window7 got a idle for every drivers that dont get use alot ..so they said to go in regedit and change the time laps before get idle ..cos i was checking my videocard in game and my videocard was at 20% use and keep black out ,crash and recover ..then i did what they wrote and no more trouble i dont crash anymore