Interesting. Is that (the instability) possibly a constraint of the USB-4 out, I wonder?The good news:
Yes, on this motherboard (Asus ProArt Creator Wifi X670-E), you can plug the discrete GPU DP-OUT into the motherboard's DP-IN, and then connect the CalDigit TS4 to the motherboard's EC1 (top-most USB4/TB3 out) USB-C slot. You will get 5k (not 6k) display, and your mouse/keyboard all working through one cable, like everything else that uses the TS4.
The bad news:
If you are also running your peripherals through the same connection (the whole point of using the dock), it is unstable as hell. Lag, lockups, crashes, etc.
But direct connection from GPU and direct peripherals works great, no stability issues.
I just built a PC with a gigabyte motherboard (Gigabyte Z790 AORUS ELITE X WIFI7) and picked up the GC-Maple Ridge thunderbolt 4 card for it. DP-out from GPU to DP-in on the thunderbolt card; plugged my CalDigit Element hub that I use with a Mac Studio and a MacBook Pro-- Pro Display XDR is running at 6k and the same keyboard and mouse are working. Fantastic. I haven't tested it extensively to see if there are stability issues though-- I've only just fired it up and tested it briefly.
Aside from not having native controls (brightness, etc) or HDR (not a deal breaker-- it's a big win to be able to have one keyboard / mouse / display) the only issue I see is that I don't get a signal on the XDR until Windows loads, it seems. (I don't see the bios / post screen).
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