I got a Mac Pro late 2013 with a AOC 34" but can not get more than 29hz. I am using DP connection. What am I doing wrong ? U3477: RES: 3440 x 1440 @ 29 Hz depth: 32-bits farge (ARGB8888) Mainscreen: Yes Same screen: OFF Connected: Yes Connection type: DisplayPort TV: yes ???? Why is this on ? and what does it "do" ?