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I have two monitors right now, one is a 4k UHD TV.

When I have the display "Extend these displays" rather than "Show only on 1" (1 is the monitor, not the TV) the screen flickers horrendously. When I do show only 1, the screen stops flickering. Why is this?

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I found the answer myself. It was because the monitor was changing the refresh rate to 60hz instead of the 144hz default or the 165hz overclock I set it to. Changing the refresh rate in my nvidia control panel back to 165hz fixed the screen flickering.

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