Naturally it also depends on what you are playing, even if you used both screens for the game. Or even three screens. Not all games are such resources hogs, though I don't know what your favourite game types are, Janice and Ani. I have never had more than a single screen, so I haven't tried them myself with any game, but I have some more serious gamers as friends and they play games on multi-screen with lesser cards than a monster like GTX 780 Ti.