Question Screen shows lines and flickers when running a game and watching a movie on dual monitors

Jan 30, 2020
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I have a self-built computer,

Ryzen 1600 OC to 3.8GHz -Runs at 35c idle and 50c-60c under load
2 SSD and 1 HDD
AB 350 Pro board
RX 590 - Latest driver
2 HP 25x 144 (Connected by Display Ports)
750w power supply (Increased from 500, because I thought it was low power)
16 GB ram (3000Mhz)

When I try to use two monitors to watch a youtube video or a movie while gaming both screen flicker and lines happen. When I move it to 144 Hz it happens more frequently and I need to drop it to 100 Hz refresh for both. The Gaming has Freesync enabled and the movie is set to high quality. I cannot figure out why it would do that. I thought it was a temperature issue since it is always at 50c-70c, so I put thermal Grizzly(Kryonaut) on the gpu die and it keeps it pretty cool. What am I missing?
 
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Use Display Driver Uninstaller in safe mode to remove all your currently installed GPU drivers, then install the latest ones again. Sometimes old drivers can have residuals left over that can interfere with normal function. Does the flickering and artifacts happen on both monitors? If it only happens on one monitor, try to use the cable for the second monitor on the first monitor, and vice versa, and see if the issue is cable-related. If this has been happening from the time you built the PC, then this might be a bad GPU.