I got a new monitor the other day for rather cheap and got the idea of running a triple-monitor setup. I know I'll need 2 gpu's, but the problem is that i have a gtx 670 with only 2 gb of memory. I was considering selling my current card and throwing in more money for a couple of 4 gb versions. Would 5760x1080 run well on two 2gb cards, or do I need to get rid of the current one and grab a couple 4gb 670's? If 2gb isn't enough, does anyone know a good place to sell your used video cards?