8.1 I disabled SLI in NCP and games work flawlessly! Funny how i was just recently planning on downgrading my computer. Getting rid of 2nd bluray drive, killer nic, some other accessories and, removing 1 690. I just don't need all this GPU power like i planned on using it at the time of purchase. Wanted to mine coins, do more folding, video editing acceleration which is shot due to CUDA changes recently, transcoding and whatever else, so I was thinking of rolling with just 1 690 for one more generation, but, i might get 1 980 or wait for the next batch of releases (Ti, etc) and just roll with a single 4GB GPU. I've been using multi-GPU since the Radeon 4870X2 and maybe it's time to go back to single-GPU for a while. Less headaches.