I have a Sony TV that is a few years old now, it only has HDMI ports but they can do 4K60hz. Attached to the TVI have a HTPC with a Intel HD 630 graphics card.
I purchased the CAC-1080 to be able to connect the htpc to the TV at 4K60 (3840×2160 60Hz), which is only supported by the DP-outlet on the HTPC. I’ve verified that the DP outlet can do 4K60 by connecting it to another screen (DP-DP).
When connecting the HTPC using the CAC-1080 to the TV i am only able to get 4K30. At 60hz the TV is just blank.
I then connected the same HDMI cable to the HDMI port of a Geforce 1080, it was able to do 4K60, so it is not a problem with the TV port or the HDMI cable.
I then try to connect the CAC-1080 to the DP port of the Geforce 1080 and using the same HDMI-cable and port on the TV. Now i can only do 4K30 again. (falls back to 30hz instead of 60hz)
So it seems the CAC-1080 is preventing me from getting 4K at 60hz, which is the only reason i bought it.
What can i do? Will a firmware upgrade of the CAC-1080 help? I have the latest graphics drivers on both PCs.