I can't agree - 'all games on ultra' at that res at 60fps with one card isn't doable - but then that's my requirement - 60fps with all the eye candy on and that does (quite often) require SLI to achieve. I have a LCD in front of the monitor showing GPU usage per card and there's plenty of games pushing both hard thesedays. If you can live with lower FPS then it's not so much a problem but then you're driving a lot more pixels than me and so the cost is much (much) higher as a result. I'm specifically avoiding going to 1440p resolution because I can't stand the low FPS it introduces and quite a few games are borderline at 1920x1200. Of course it varies, and there's also the option of dropping a few settings to get the framerates up again. Choices as always. I have a very low tolerance for <60fps
Example of game that pushes my system at 1920? Metro Last Light. Just benchmark it (it has a built in benchmark) with everything on 'ultra'.
The big reason for me going SLI was that the 670 wasn't enough of a jump up from the 580 I had beforehand. The same logic is keeping me off the 770/80 for this generation as replacements.
Oh definitely not all at 60fps constant, but none ever dip to a fps that is noticeable in terms of laginess or anything like that. Im using the latest beta drivers and overclocked a fair bit
Just did a quick test, and although not the most graphic intensive games, theyre 3 popular ones:
Battlefield 3 @ 2560 x 1440 = Average 90fps
Crysis 2 @ 2560 x 1440 = Average 70fps
Skyrim @ 2560 x 1440 = Average 70fps
These were during moment with gunfire/fire/etc
So a 770 will definitely run games at your resolution quite comfortably IMO