If games you're going to play don't scale well with 2 cards, let alone 3 cards. Then I doubt you'll get playable framerates out of it. Triple 4k is 11520 * 2160 = 24883200 pixels. A single 980 Ti can't even get to 60 FPS on a single 4k monitor, and because scaling (SLI) won't give you a 100% boost each time, the FPS will probably stay around 30 FPS, if not lower, if everything scales well...