Loading No, running No, process maybe.Would that 2Gbs have a faster loading, running and process time than just one card? I believe yes. So two GTX 2gbs would perform better than 1 GTX 2gb.
Doesn't matter 1 gpu or 10 gpus, a frame comes the cpu only so fast, gets refreshed on the screen only so fast, but since each card only processes half a frame, sure. In one respect. In other respects, no. And that's highly dependent on the game code and its level of SLI support. There were more than a few games whose SLI support was so abysmal they actually got less fps on screen than a single card alone. Many games got equitable fps, many games got varying degrees of improvement, but no games got double or even close.