Hey noobie here.
Was lucky enough to get a sapphire rx 6800 reference design. I installed the 20.11.2 driver. However, I get these flicking black screens on Microsoft flight simulator 2020 and for gta 5 it goes black screen so I cannot even play. Everything is running stock and I have a brand new 750w corsair rmx series psu. I am using an i7 4790k, asrock h97m anniversary edition, 16gb ddr3 memory with windows 10 pro version 2004. I have uninstalled the nvidia drivers as well.
Also for some reason the displayport does not seem to be able to display 3440x1440. I am using a dp 1.8 3m cable. I have tried both of the displayport outputs. I have used a hdmi cable and it seems to work fine.
Cheers