I use a CAC-1085 for DP1.4 to HDMI2.1 8k 422 30Hz.
Source is a RTX4000 (Windows 10), sink is a SAMSUNG QE55Q700TAT tv.
With the CLub3D HDMI2.1 cable it works, but with a active 20m cable (Inakustik Certified HDMI2.1) it is limited to FHD (but 8k is possible in the Nvidia control panel).
Inakustik warns me about power delivered by the source, for higher resolution it can be about 5V/400mA! There nothing about the power delivered by the CAC-1085.
I already asked the support, no reply at this moment.
Anyone knows about this point?