Wondering if the 3gb offers any significant improvement over a standard 580 or if it doesn't matter with one monitor? Planning to SLI. Hoping to sort of keep this gaming rig for a few years without having to upgrade much if that changes anything.
You will definitly need 3 gb for playing at 2500x1600 resolutions and 6 gb is even better. It will also help future proof you gaming rig for about 2-3 years because it would take the game builders that long to get to where the recomended spec's would pass two gtx 580's 3 gb in sli. Of course before then the temptation to buy the latest and greatest video cards might be too much.