hhmmm... i don't understand why the spec isn't significantly different than the 780. i don't think that this 880 can do 4k with everything maxed out without lagging, or maybe 1600. i'm using 780 right now and everything works really well for 1080 with everything maxed out. i plan to buy 1600 monitor in the future, but for that, i prefer wait for 790 launched on the market rather than buy a 880. that will be a lot better.