Nevermind, won't matter if you get a GPU with DP 1.2 because only Panasonic UHD TVs has built in DP 1.2 ports, everyone else is HDMI 2.0. So you would have to get a gtx 970 or 980 to use 4k@60Hz, but as you probably have heard, the 970 has less specs than it appears, so it won't be as good for 4k. So your only option is the gtx 980 or wait for a new kind of GPU like the 390x or 980 ti.