Flickering may be due to gpu unable to support video application.  This happens for example when try to play modern game on integrated gpu.
Just got a Sceptre 49" wide screen monitor recommended for 5120x1440.  Using DPI connection.  Videos on YouTube or other sights are flickering with lines causing the screen to black out, come back and repeat.  This happens unless I have the window small or maximized.  The monitor states it should have up to 120ghz but can only select 60 or 59.94 ghz.  Not sure if that is related to the problem or not. Any help would be appreciated
Optiplex 7080 video issues on 49" monitor