USB 4.0 will support data transfer speeds of up to 40Gbps, just like Thunderbolt 3 Today, Intel announced that it's contributing the Thunderbolt 3 protocol spec to the USB Promoter Group, and with that, the USB Promoter Group announced the USB 4.0 spec. USB 4.0 will support data transfer speeds of up to 40Gbps, just like Thunderbolt 3. The new spec is backward compatible with USB 3.2, USB 2.0, and Thunderbolt 3. Remember, USB 3.0 and USB 3.1 are now called USB 3.2, with USB 3.0 being USB 3.2 Gen 1
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– https://www.neowin.net/news/usb-40-to-adopt-thunderbolt-3-with-40gbps-data-transfer-speeds/

Source: https://www.youtube.com/watch?v=HXsGKYXOmEk