Good day TeabagXpress,
I do knwo that CrossFire and/or SLI can be “in the way” of CAC-1070 / CAC-1170 functioning in a proper manner. Is there any way to disable Crosffire with the Dual R9 390X Card you have ?
Setups with TV’s normally work best by making a custom resolution, in this case for: 3840*2160 at 60 Hz with Timing Standard set to CVT-RB (Reduced Blanking).
(For setups with Monitors Timing Standard can remain on “auto”.)
On most TV’s you will need to do some settings like “Enhanced Mode”/ “PC-Mode” and/or “UHD Color” for the HDMI 2.0 port in use.
Please make sure the HDMI port of the Screen/TV supports 4K 60 Hz, often not all HDMI inputs support that.
Please make sure the Software of the TV is updated
Please make sure the HDMI Cable is capable of 4K 60Hz / 18Gbps.