I have gone from a 5500XT to a 7800XT and with the same configuration of 6 monitors, 3 of them in a single DisplayPort port using mst, to not being able to use two of them.
I can only turn on or leave a maximum of 4 operating, regardless of the order or port that the monitor uses. When I try to activate more than 4, it does not turn on. You can have the three mst monitors and one more, I can have two of the mst and two physical, and so on in all combinations, but with a maximum of only 4. It seems like a problem of limiting the maximum monitors, but with the old 5500XT I didn't have that problem.
Is there now a maximum limit of 4 active monitors on the new graphics cards?