Thanks for clarification. It will be a while before I get round to testing the bit depth of those adaptors, but it is something I hope to get done before I dieThis is from Anandtech:
Meanwhile VirtualLink ports, which were introduced on the RTX 20 series of cards, are on their way out. The industry’s attempt to build a port combing video, data, and power in a single cable for VR headsets has fizzled, and none of the big 3 headset manufacturers (Oculus, HTC, Valve) used the port. So you will not find the port returning on RTX 30 series cards.
So the only way to use USB-C adapters with new cards is this or this (and other methods that I don't know)
Same specs because they both have a 17.28 Gbit/s digital input bandwidth and a 200 MHz DAC, but Synaptics is 8 bit and Lontium 10 bit , information obtained from the respective manufacturers (can be bullshit)