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#11
You are definitely going to need to SLI for 4K. I myself use a 30" monitor that runs at 2560x1600 and to get an average of 60FPS on it requires SLI. To get smooth playback on 4K even at 30FPS will require a lot of power. And if at all possible, whatever you decide to do make sure the screen you get has Displayport. Displayport will allow you to get 4K and give you a chance to get up to 60FPS with a single cable!
However, you don't need to always run the games at the 4K resolution, you can easily run on a lower resolution.