False, ue3 doesn't only use 1 core. Disable 3/4 cores and try to run any ue3 game with a reasonable fps. It uses all the cores, some more efficiently than others. 120fps, the cores 1, 3 uses ~65%, core 2 4, ~40%. If you fire up task manager with a 4 core 8 thread cpu. Split it into 4ths like a...