Soldato
1080Ti can do it already if you are happy to tweak settings a little on a few really demanding games. 1180 should be able to do it just fine. But obviously not at max settings i.e. 8X MSAA etc. If people want that then they have to wait another 2-3 gens of cards. Lol.
I have a 1080Ti (since launch), had a UHD screen for about a week, got rid of it. I couldn't run anything at the time at acceptable framerate without lowering IQ settings (not talking AA here). Also, 60hz.
Hopefully the next generation **80Ti will change matters and we see more 120Hz+ UHD screens.