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.
I am using the latest drivers and the only thing that has changed in the system is the graphics. And the monitors are HD resolution and some are 1280x1024 (they are small satellite monitors)
Is there now a maximum limit of 4 active monitors on the new graphics cards?