Hi everyone, first of all sorry for broken english
As you read in the title I get flickering black lines across the screen when using a custom resolution (1728x1080 16;10).
However this only happens when the monitor is set to use 240 hz if I go below that I can use the custom resolution just fine.
Also I can use the custom resolution 1440x1080 (4:3) and 1920x1080 (16:9) at 240 hz perfectly.
Hope somebody can help me here are my specs:
GPU: R9 390
Monitor: acer predator kg271b 27" 240hz
I know the videos are in really bad quality but you get the point xd