I was looking for a new USB-c hub and came across this article. It’s an interesting write-up of what is on the inside of some popular options

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    51 year ago

    Alt-Mode HDMI stopped at 1.4b. Everything now is DisplayPort Alt-Mode to HDMI. The translation is simple enough it can be done passively and components can fit inside the connector, meaning it looks like a simple cable.

    Drawbacks are you can’t get GSync, Freesync, or VRR. Also Nvidia’s drivers only output 2.0 Audio over DisplayPort, so no surround sound.