Question rx 850 8gb problem

[josed2037]

so i bought this msi rx 850 oc 8gb to a guy to renew mi gtx 1050 ti and now i got some problems i cant play 4k videos on YouTube, the option not appear on the quality buttom but, i can set a 4k resolution on my screen settings but when i put the resolution on 4k and 59 or 60hz ,the screen is flickering but when i put in 50hz
drivers are update
nvidia drivers deleted
same settings in the 1050ti and the rx 850 no problems in the first

 

[stefanos50]

First of all did you do a clean install of the drivers with ddu program ?