Hm ..then something is broken, because when I set 540p resolution doing 2x SS, I get 1080p final image![]()
It should be rendering 1080p internally, but if your output resolution is 540p it's still going to look like crap because it's a 1080p image that has been downscaled to 540p.
Supersampling changes the rendering resolution, and then the image is adapted to the native resolution, so downsampling means less work for the rendering (i know because i have to downsample to get reasonable fps in settlements with odyssey)
edit: i'm probably using wrong terms here. what i meant for downsampling here, was to set supersampling to lower than 1, which it's probably formally wrong because the rendered image is then upscaled
The description is largely accurate, though technically, supersampling below one is upscaling.