Success: 4K 60Hz 4:4:4 on Mac Pro 5,1 2010
I have the following set-up:
Mac Pro (Early 2009 upgraded with 5,1 mid 2010 firmware) Mac OS 10.10.5 with GTX 980 graphics (standard PC-version) -> DisplayPort ->
Club 3D CAC-1070 adapter Rev A0-00 FW 70 1552 ->
HDMI 2/DVI input -> Samsung UE48JS9005 (Curved Euroversion with quantum dot LCD panel)
After switching the TV control HDMI UHD Color to On I am getting full 4K 60Hz 4:4:4
Thanks Club 3D!