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USB 3.2 (and currently USB-C from it) doesn't support the 48GBps that HDMI 2.1 and 32GBps that display port 1.4 call for. USB supports a max of 20 GBps at curr

USB 3.2 (and currently USB-C from it) doesn't support the 48GBps that HDMI 2.1 and 32GBps that display port 1.4 call for. USB supports a max of 20 GBps at currently. It's possible you can get more bandwidth using an alternate mode in the connector, but the spec says you can only guarantee up to the 20GBps over those modes currently. This means the higher resolutions and higher bitdepths (10bit, HDR, etc) may not be possible to push over the connector. This is why Thunderbolt 3 requires special active cables to get the additional bandwidth by amplifying the signal to help get around the bandwidth limitation of the connector in a passive configuration.

Dylan16807 9y ago
> It's possible you can get more bandwidth using an alternate mode in the connector, but the spec says you can only guarantee up to the 20GBps over those modes currently. 20Gbps per what? One lane? Two lanes? I haven't heard of this, where can I find more info? (If it's actually 20GBps with a capital B then we're nowhere close.) > This is why Thunderbolt 3 requires special active cables > the 48GBps that HDMI 2.1 and 32GBps that display port 1.4 call for This part isn't right. Thunderbolt 3 can run 40Gbps over short passive cables. And that's bidirectional. It's the equivalent of 80Gbps for a display cable. Displayport 1.4, at 8.1Gbps per lane, is actually slower than USB 3.1 Gen 2. HDMI2.1, at 12Gbps per lane, is slightly faster but still well short of thunderbolt.