I'm currently running one and I've noticed that in Metro Last Light I'm not able to fully max it out with 4x AA. Even at 2x I still get drops below 30 fps and its irritating.
Will a second 770 be able to max it out and possibly crysis 3, BF4 (speculatively), and other major titles without hitting that VRAM limit?
I plan on using this 1080 for a while. Maybe a triple monitor in the future but not any time soon.