Nvidia Tegra K1 runs full-on Unreal Engine 4 on a tablet (video demonstration)

This is not the first impressive demo of Kepler we’re saying, but it’s a very convincing one, with a real-world game engine. Nvidia has taken care of gamers with one more software feature called G-Sync. G-Sync aims to basically be an improved V-Sync that avoids the occasional stuttering and screen tearing that forces many professional gamers to actually turn off V-Sync. Simply put, G-Sync synchronizes the 60 hertz output of most monitors with the varying framerate of games (intense fights can lead to low single-digit frame-rates while in other situations games run at more than 100 fps), minimizing lag along the way. This is a feature, though, that seems mostly targeted at non-mobile form factors.
What should really give you a good idea of the Tegra K1, however, is the actual demo, so with no further ado, watch it right below.

source: Nvidia
Things that are NOT allowed: