Hi,
I am currently running a 7900 xtx card, with two monitors connected. One of them are the new "Samsung 57 Neo G9" which runs at 7680 x 2160 at 240 hz and the other is a "Samsung 32 G7" and runs at 2560 x 1440.
The issue here is that the moment I connect the 32 inch monitor, my 57 inch drops down to 120 hz and not able to exceed that. There is no issue running the 57 inch at 240 hz when its alone.