I have a single gtx 760 2gb model and an amd fx 6300. I am seriously considering another gtx 760 and an fx 8350 to go along with the two gpus. I really want to get more performance and run at higher resolutions. Would i be able to combine a gtx 760 2gb model with a 4 gb model? Or will 2 2gb models be able to play games at 1440p resolution? The performnce of two gtx 760s is much better than the $ 700 ti and the 1000$ titan.