Does Xbox support 1440p?

Xbox One X will support 1440p monitors. There will be no drop in picture quality for 1440p displays. With less than a week to go until its release, more details are emerging about the Xbox One X. We've known all along that Microsoft's all-powerful console would output at native 4K on a 4K TV or display.

Does my TV support 120Hz?

The TV will need an HDMI port, at least. But yes, 120Hz (and large 1440p) monitors do use Dual link DVI, HDMI, and D-sub. Apparently HDMI will do 120Hz but only at 720p.

What is the refresh rate for Xbox One?

Xbox One has now gained support for high refresh rates, supporting up to a 120Hz signal on compatible displays. This lifts the previously-imposed limit of 60Hz on the console.