Hi Guys, I just bought VP2780 monitor and even though at the "About this mac" I am seeing the monitor correctly with a resolution of 3840x2160, when i am trying to set the resolution of in "Display preferences" the maximum i am seeing in the scaled list is 3200x1800. I got an Nvidia GTX 780 card and I am using the Display cable at the moment. I tried to use the HDMI also and other than the refresh rate (60 vs 30 Display port/HDMI )i do not see a change in resolution. However i tried to plug both cables at the same time and then the Mac though i got two monitors and if i clicked mirror display i could then set the 3840x2160 resolution but to be honest i am not sure what the implications are of using both Display and HDMI cable at the same time into the same monitor when trying to full the MAC pro that it has 2 monitors nor do i find a logical explanation as of why the 4k resolution is working with 2 monitors and not with one. Did someone see this issue before? Did you manage to sort it out? Thanks !