How one Thunderbolt 4 port could support two 6K XDR

[cheukfh]

I bought a Caldigit TS4, and the website show me it could run 2 XDR in 6K 60Hz over one TB4 cable.

I understand M1 Pro / Max / Ultra can using DSC to do that, but I can't understand why 2019 MBP 16 with Navi Radeon Pro graphic card are unsupported, it also support DSC too.

any way to explain that？

 

[joevt]

any way to explain that？

No except maybe MBP can't handle all the pixels of more than one XDR? Has anyone actually tried connecting two XDR to a single Thunderbolt port of the 2019 MBP using a Thunderbolt 4 dock?
I would try these steps:

- Connect two 4K displays to a Thunderbolt 4 hub/dock connected to the the 2019 MBP to make sure it can support two displays.
- Connect one XDR display to 2019 MBP and use AllRez to see if it was connecting using HBR2+DSC instead of dual HBR3 to get 6K60. Try Catalina if Big Sur or Monterey don't enable DSC.
- Connect one XDR and one 4K and use AllRez to make sure they are connecting at HBR2 and getting 4K60 and 6K60 with the XDR using DSC.
- Connect two XDR.