I must be missing something mine crashes driver ver 340.43 within 3 sec's (forgot to add gpu 750ti ftw stock)
What algo/kernal are you trying to run?
If CryptoNight did you previously run the Reg Hack that changes the timeout of the display driver timeout?
How much memory?
How many GPU cards?
What is the command line you are using?
Did you try a different algo just to see if that would work?
Carlo