https://wccftech.com/ps5-trick-4k-1440p/

As it stands, Sony’s freshly-released PS5 doesn’t support native 1440p resolution, but some displays can allegedly trick the console into accepting a 4K signal before downscaling it.

The PS5 currently doesn’t support 1440p resolution due to Sony having focused on TV displays. As reported earlier, this isn’t a technical issue and Sony has said that native 1440p support might be added through an update in the future if there’s enough demand for it. As covered yesterday, MSI has already promised a fix to support the resolution through its ‘console mode’ on some of its monitors.