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My screen is 144hz 1920x1080. I (stupidly) bought a switch that only supports 1080p (to get my Nintendo Switch, PS4, and PC all on the same screen with one cord).

So when I boot my PC and put its video through the switch, the only available resolution to pick is a very low 1024x786 (and one lower).

When I go directly from the PC, I get all options including 1920x1080 (preferred).

So my question is, if I buy a switch that purports to pass through 4K signals, is that 'enough' and does HDMI work in such a way that it will sufficiently downgrade/sample my signal to my monitor's native resolution?

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Switches are passive units, generally. If the switch supports 4k, that simply means the proper signaling will go through. It will not affect a 2k signal, as it is simply passing it through to the monitor.

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