Yeah, first you will have problems with sli as usual.
It has nothing to do with that specific res, but it is proven, that ati cards can maintain higher fps in higher resolutions and the nvidia cards are better able to max out the lower end of the fps, which can also be good. But higher resolutions mainly mean, that ati becomes better and better. And as you can see in all benchmarks, the 7970 is the fastest gpu and smashed nvidia this year by no doubt.
It is not only important, how big the vram on the card is, but also how fast the interface us. As far as I know a 660 only has 192bit interface, while ati has 384bit. It is double. And especially in the field of streaming engines, it has a clear advantage in shovelling data fast.
2gb cards at your res could be enough, but stuttering can be still a problem.
Also think of getting an ssd. It is worth it in my opinion. Not only for the game, but for overall rig perfirmance.
I spoke about even higher resolution. Triple screen setups demand so much, that an sli setup with 680's is simply too slow. It demands too much from a card, which is only on the market as quick solution against ati and not as a well planned card. That is, what makes me even more angry about nvidia this year. You get a quick shot card, which is underperforming. Kepler is good, but the rest of the card and the vram interface is just to laugh at. It is a big boy casual gamer card and not a core gamers choice.
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