Thanks for trying. I’m unfortunately out of ideas.

Try 144 or 165 if you have it. It’s some sort of matching game rather than hardware compatibility.

What is your resolution and refresh rate set to? MacOS can be quite picky.

I use four monitors for my WFH setup with a total of 11.8m pixels. Three 6k monitors is 37.3m pixels, more than three times what I’ve got. I’d be seriously considering this if I could run all four, but for now the hackintosh lives on.