@juanpc2018 im using 4K TV at 1080 FullHD Native resolution,
because text is hard to see at 4K without Scaling, and i dont like Overscaling 200% 300% on a weak machine 8GB Ram, integrated graphics, etc....
but probably 1080 played at 4K would be similar setting,
and 4k played at 4k, setting 4 could be too much, probably 3.
maybe a setting for each resollution is too much,
but in pairs, seem ok:
240 ... 360 | 480 .. 720 | 1080 .. 1440 | 2160 .. 4320