because the scaling feature will use these lower values as the output resolution and then upscale them to your display to preserve GPU processing and offer better performance.
the same way DLSS works in games.
Hmm. I'm not talking about DLSS, I'm about DSR.
With DLSS, the image is generated at a lower resolution than native and then scaled to the maximum resolution of your monitor. It's clear and straightforward.
And with DL/DSR it is just the opposite. The image is generated at several times your native resolution and then scaled to fit your native resolution !
And IMHO - with DSR I should be seeing instead 1.78x DL (1707 x 1365) ... a value larger than my native monitor resolution of 2560 x 1440 ... or am I misunderstanding the DSR scaling ?