I have no probs so far with the 320.18, but my cards only a day old so hasnt been extensive tested yet (ran 3DM11, A New Dawn, Metro LL, Crysis 3 and Tomb Raider for around 20 min each). For those wishing to use earlier drivers, you will need to modify the driver INF. These are the 770 strings you will need to insert under respective headings: