well I wanted to be safe for now, and a few years into the future of games, the reason I wanted to have the SLI option was because if I get a powerful card now, then as it starts to have trouble running games down the line, it will be cheap, and I can just get another, to have twice the power. I know I am extremely oversimplifying, but adding another one of these 4gb cards when they are only a few years old would still make them close to as powerful as (or more) of cards from that time, for cheaper. I just like to have my options open.
And since those take 2 slots and my 3 are all in a row, (you probably cant tell unless I try) but if the first one covers the 2nd slot, and I decide to get another, can I just put it in the 3rd slot and the extra width can overhang? The PC's rear has more than enough room for both cards outputs to be there, its just that I have 3 cards, but both say they take up the room of 2.
in any case, either of those cards, especially the 4gb one, should be exponentially better than my current card, and that's all I really ask for. I can only run newer games, on med low settings at 30fps (sometimes higher) and I wish to rectify that. These new particle effects and shadows and shaders are what kill my current card the most, and I end up having to disable those options completely most of the time.
I wouldn't say I was a "Hardcore" gamer, but I do keep up with a lot of stuff, and play certain games a LOT. (off topic, but if you are a warhammer 40k fan, or a planetside fan, did you hear about eternal crusade? looks to be like a 3rd person planetside with horizontal progression and skill based combat-no abilities like traditional mmos. It will start with Space marines, Chaos marines, Orcs (which is the faction FTP people get, which is genius) and Eldar)