Question Random lines appear and disappear when playing games ?

Jan 25, 2021
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Hello everyone!

Recently I bought a new PC and had it built up. It's characteristics are the following:

Windows 10
Radeon RX 580 8GB GDDR5
Seagate BarraCuda 3.5" 2TB SATA 3
RD500 NVMe SSD 500GB M.2 2280 PCIe 3.0 x4
DDR4 3200Mhz PC-25600 16GB 2x8GB CL16
Old monitor with a VGA entrance input (Resolution 1300x756 I think)

I've just installed the PC and it's Windows 10, and a couple of days ago, I was playing "Conqueror's Blade", when suddenly random lines started appearing and disappearing very fast. At first I didn't even notcie they were there, but when I changed games I've noticed.

As my monitor is old, I've created a custom resolution (1600x900) with the RADEON driver.

Here's an example of what happens to my monitor when I'm playing:

View: https://youtu.be/VrTwqWdBgu8
 
Jan 25, 2021
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Update:

Changed to a 1920 x 1080 screen, with a HDMI entrance input and 1080p, but the problem is still there. I've seen that when any kind of game that this problem happens, the task manager says that the power usage of that app is very high?
 

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