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Very few GPUs can effectively drive an 8K display, and at 4K it's basically impossible to see pixels anyway. The FPS upgrade is wayyyy better.
30 to 60 is best
4k to 8k isn’t worth it since 4k is already good enough
60 fps makes things smoother
30 to 60 is way more noticeable, 4K to 8K would probably just be crazy resolution to even crazier resolution, but I don’t really know what 4K or 8K look like