Anybody using a riMac with the M290X and an external 4k monitor?

[cstromme]

With the slowdowns I'm experiencing with the M290X (the Mission Control bug, plus slowness moving between Spaces etc) I'm really worried about how this computer will be with an external 4k monitor attached.

Anybody here have the M290X GPU and an external 4k monitor connected and can share their experiences?

 

[macmee]

Running a 4k off the *upgraded* graphics and it's pretty decent. There is a VERY slight lag though. You should probably expect it to work but to also experience some lag I guess.

 

[EnderTW]

4k external on base model. it's actually very smooth, I don't have a problem with spaces.

Only lag I see is the mission control, animation stutters before it shows all the windows. with one or two windows it's super smooth.