I've got a 4k monitor but after installing win 10 I get two one inch black bars on the sides. I am running it in 1920 x 1200 mode so I can see the game I am playing. I have a RX480 vid card. The display is correct when I run it under win 7. I thought there was a setting to allow overscanning or something but I don't find it. Any ideas? Thanx in advance.