What do your eyes tell you. Does it look better, worse or the same. If it looks worse then yes it is affecting your game quality otherwise your good to go.
Shouldn't you do a completely clean instal of the Nvidia drivers?
Completely clean, ie uninstall. boot into safe mode use something like DriverCleaner to remove old drivers, then reboot and install drivers again; you might want to try an older version.
No idea if that would help, but it'd be the first thing I'd try, as the problem seems to be with the driver (or hardware itself).
Edit: Given if you notice a negative image quality.
Edit 2: I'd call support if your card is still under warranty.