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5760 x 1080 = 6,220,800 pixels. 3840 x 2160 = 8,294,400 pixels. Some enthusiasts have been using 5760 x 1080 (3x 1080p Eyefinity/3DVS) for nearly 4 years now; and 5760 x 2160 = 12,441,600 pixels (six-monitor Eyefinity), has existed all that while. So 3840 x 2160 isn't ahead of its time. Anandtech's review runs all its games maxed out (which could include settings such as 8x MSAA), and obviously a GTX 680 will crawl. The fact that it's even doing 20-30 FPS on some games, shows that 3840x2160 is very much doable with today's hardware. You just need to turn down a few settings.
At 3840 x 2160 I'm sure AA is not needed.