Upon trying to update my drivers via Windows' Device Manager max resolution became 1600 x 1200 while monitor has 1920 x 1080. Since something clearly failed, I decided to download official drivers for my system from -radeon-hd/ati-radeon-hd-5000-series/ati-radeon-hd-5450 . I tried forcing a Full HD via CCC, but all I got was a stretched image with terrible refresh rate.