https://www.theverge.com/2018/4/24/17277232/xbox-one-april-update-freesync-support-1440p-low-latency-mode

Microsoft is rolling out a new Xbox One update today that centers on better audio and visual support. The biggest addition is 1440p support for the Xbox One S and X, allowing gamers to use a monitor and make the most out of QHD (2560 x 1440) displays. It’s a resolution that’s usually popular with PC gamers, and Microsoft is also adding AMD’s FreeSync support to allow compatible displays to sync refresh rates with Microsoft’s consoles.

FreeSync, like Nvidia’s G-Sync, helps remove tearing or stuttering usually associated with gaming on monitors, as the feature syncs refresh rates to ensure games run smoothly. Alongside this stutter-free tech, Microsoft is also supporting automatic switching to a TV’s game mode. Auto Low-Latency Mode, as Microsoft calls it, will be supported on new TVs, and will automatically switch a TV into game mode to take advantage of the latency reductions. The Xbox One will also support disabling game mode when you switch to another app like Netflix.