One question I have is, how important is AA at the higher resolutions?
I have a GTX 680 2gb, and have been very happy with it. But when I jumped to the higher 2560x1440 resolution, I noticed some games don't perform as well with AA on. This hasn't been the case for 99% of the major games that I own (Skyrim maxed out Mods and BF3 run just fine with it) - but Sleeping Dogs for instance, ran like crap for me with AA on Ultra.
I had to turn it to low, and it went from 20fps to 60fps. I personally couldn't tell the difference between AA ultra and AA low at 2560, but maybe I don't have the best eyes. The other question I have, is this a case of the card not having enough memory to handle certain games with AA fully on at this resolution? Or is it just the game itself, and it not being optimized (graphic drivers etc.).
I was considering SLing my GTX 680 with a 2nd 2gb model. But I haven't had any issues with performance, outside of that one game. Although I'm kind of worried about investing in a 2gb SLI. With Max Payne going over 2gb at this resolution, I wonder if that will be the case with a lot of games in the next 2 years. Making me wonder if it's better to just save up, and get two 4gb 680s and Sli.