Hi there, I have 2 GPU cards in my system a 4 gig and a 2 gig card. I have never had issues using one (2gig) for my OS and the 4 gig for rendering. Today no mater what i try my OS card is lagging a ton, cant really use the system at all. if i select teh 2 gig as the card to render and use 4 gig for OS things a fine , i am running the 1.2 build and like i said up until today i have not had issues.
Any thoughts on what may cause this?