Yo !
No hardware problem with my 7900 XTX , it runs very well in games ; just for me a little too power used as it uses max power for every scenes and every games .
My problem is software , either drivers or windows 10 source . When i add a displayport 1080p screen to my 4k hdmi main screen , the 1080p one is displayed at half in height . Resolution becomes 960 x 1080 for my 2nd screen , and now it changes automatically the main screen to the less working screen .
It worked with the 5500 xT by means of Hdmi scale at 4% or 0 %
Of course , happy new year everyone !