I just got in my CAC-1170 to connect my Mac Pro (2013, D700) to my LG 55UF7600 UHD display. In both Windows 10 (Boot Camp) and OS X (10.11.3) the most that I can get is 2160p 30hz, the same as using the HDMI 1.4 connector on the computer.

When UHD Color is disabled on the TV I’m able to get a 2160p30hz signal, however when I enable UHD Color the TV displays “No Signal”. The odd thing is that the EDID’s are matching up so that the Mac Pro is outputting a 2160p60hz signal. When I remote into the Mac Pro I’m able to see that it’s running perfectly, but the TV won’t accept it. Using SwitchResX I was able to get a 2160p60 image, but with a green cast.

I tried connecting the adapter to my Macbook Pro (late 2013 with Geforce 750M) but that brought a whole other set of challenges. The Macbook saw the display as being 7680×4320 @ 24hz. The color was fine, but I seemed permanently stuck at 24hz.

I’ll try them both in Boot Camp some more, but had no luck yesterday while attempting.