I have an ASUS and I switched to its "FPS" mode in Armoury Crate.I was then able to see the difference, but it is really subtle. My monitor doesn't have 4K, so

I have an ASUS and I switched to its "FPS" mode in Armoury Crate.I was then able to see the difference, but it is really subtle. My monitor doesn't have 4K, so maybe that might make the difference.