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this post was submitted on 17 Jul 2023
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DisplayPort 2.0 can 5k/120 with DSC and UHBR 10 cables, or 5k/120 without DSC on UHBR 13.5 cables. HDMI 2.1 can handle 5k/120 with DSC in use.
It's not a bandwidth limitation.
But is there enough bandwidth to spare such that you can still send data back the other way? Pretty much all displays function as a USB hub as well.
Yes. Thunderbolt 5 supports DP 2.1, with up to 80 Gbit/s of bandwidth. A 5k/120 with 10 bit color and no DSC display needs 57 Gbit/s of bandwidth.