this post was submitted on 01 Sep 2023
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Might also need to check what the ports on your monitor support. A high quality DisplayPort cable will probably solve the issue, but make check the spec on the HDMI and DisplayPorts on your monitor to make sure they can support higher the higher bandwidth needed for high refresh rate/high resolution monitors. If your HDMI is only v1.4, but DP is 1.2 or 1.4, definitely use DisplayPort instead.
If you just used an old cable that came with something for free, I would buy a proper cable that supports the newer DP or HDMI specs from someone like KableDirekt.
Thank you for the advice!
Unfortunately I've tried a number of very expensive cables, as well as multiple graphics cards. The monitors used to be fine, but over time they started getting all these horizontal lines across the screen if I go above 100hz. I've also tried Mac and Windows and same problem with both.
I've looked it up though and seems to be a common problem for AOC Agon monitors, so my fault for cheaping out, even though they still cost me $550aud per monitor :(