Huh.. No idea here.. When I had one 980ti, I could play in 4k (just couldn't turn setting up) just fine.
yeah its frustrating but I will figure it out from what I can tell its a setting somewhere so I just have to find it.
Is it possibly a limitation of HDMI? Sometimes that gives problems with 4k.
I have no idea, I deleted all y display devices through device manager last night, and reset and reinstalled everything, Still the same no-change, Even rebooted in safe mode to see if I could change it, and nothing. Sad thing is I can pull the 980 out put my 760 in and can change to whatever res I want :(