Atm I have a gtx 560. There are a few games which are a little slow/laggy with 3dvision (can't use a lower res, 3dvision only supports 720p and 1080p). I'm looking for a card twice as fast, but also only twice the price (i can get store credit for my used 560). For a smooth experience, it seems that 3dvision needs to deliver 30fps to each eye. So it seems I'd need a card that never dips below 60fps for most games. I'd run SLI, but that means buying new mobo (SLI 1156 boards don't seem to be sold anymore), cpu and SLI psu, which would end up being more than a single 580. Anyone else had experience with 3dvision?