CScottG wrote:Not really. It depends on the game, and the settings.
My guess is that most games (that can display UHD) are probably playable with most settings in the "medium-to-low" GPU-strain category with a 1070 or 980ti with a few graphics settings at "low" or just off. For the most part the resolution itself is just a LOT more important than those extra settings. (This of course is *not* with respect to "competitive" game-play, and particularly of the 1st person shooter variety: at that point you really want a much higher frame rate than what would be considered "acceptable". It should still be fine with regular game-play and 1st person shooters.)
If I had a 4K monitor, I'd run at 4->1 pixel interpolation and play games at 1080p. The stress on the graphics card would be far less and I could run at max settings. Then again, not all 4K monitors apparently support that option.