Will the Xbox Series X or S be able to be down scaled to 720p - 1080p?

Hi there.

Thank you for reaching out to the forum. Yes, the series S/X does support 1080p output.

I have a similar question. So if i have a 1080p TV will the Xbox Series X work fine on that? and is it worth getting the Series X for a 1080p TV? What are the advantages?

The Xbox Series S/X only has a HDMI socket for display, so it will only support that display option. As for 720p or 1080p, it should support 1080p, but 720p is anyone's guess, as Microsoft haven't stated if it supports 720p or not.

Just choose 720p, since the 360's auto leaves a bit to be desired. The 360 may have selected 1080p because your TV probably accepts a 1080p signal, but downscales it to 720p. Since most 360 games run at 720p, that is your best option. Leaving it at 1080p
means the games will have to be upscaled from 720p to 1080p, only to be scaled back down to 720p by the display. Doing that can only cause harm, to the picture quality.

Since your set is 720p, use 720p. The vast majority of 360 games are 720p anyway, so this is a no-brainer. The games are 720p, the display is 720p... Why use 1080p? Since your TV is 720p, anything you send to it at 1080p is just going to get scaled back
down to 720p, where it started to begin with.