You aren't going to see huge differences on a 28 inch TN 4K monitor.
That said, you should be able to tell the difference between NGU very high and EVR's upscaling, notice how much sharper NGU is? Use ctrl-J to see the OSD so you can verify what is happening.
Also why are you using CUVID? I strongly recommend DXVA2-copyback instead. NGU medium or high is a great option for chroma as well (NGU very high is my preferred chroma upscaling method, after testing, but medium or high is so similar it is a easy tradeoff if you need the performance).
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