40Gbps is used for the USB4 pass-by way of port, although the next Thunderbolt port distributes 40Gbps of bandwidth to the rest of the ports to the hub. Verify the hub specs to discover which shows they support: some are limited to High definition shows, Many others support 4K (also https://dallasmhbuk.liberty-blog.com/26739118/the-ultimate-guide-to-usb-to-hdmi