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Nintendo Switch emulator Ryujinx got a pull request yesterday that adds resolution scaling up to 8k!
User shouldn´t run more than double of their output resolution if they want a supersampling effect.
So use 2x for 1080p screens, 4k screens 2x or greater - you should only go higher when your GPU can definitely handle it.
4x (8K) is 16x the switch's pixel count!