The difference between Thunderbolt 4, Thunderbolt 3 and USB4

The latest Intel standard is the Thunderbolt 4 but what is the advantage? Computers, laptops etc with Thunderbolt 4 interfaces can run two external 4k screens from the same port, both at 40Gbps speeds, whereas a Thunderbolt 3 port can only run one 4k screen. Additionally, a USB4 port can run one screen but there is no minimum video requirement that the computer has to meet.

To be able to use these computer ports for the 4k screens, a Thunderbolt 4 compatible cable must be used. Also only Windows based computers can run MST video (Multi Stream Thread). Where two video streams can be sent down one Thunderbolt-capable cable to a Thunderbolt 4 dock where the two screens will be connected. This then gives the three different screen solutions at 4K. For Macs two separate ports have to be used for two external screens showing different streams. Macs only support SST (Single Stream Thread)

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