Am I actually seeing 120hz over HDMI on the Xbox One S?

from the xbox insiders reddit:

"

Xbox One Insiders - 120Hz FAQ

Q: I don’t see the dropdown under the Video Output settings that allows me to select 120Hz refresh rate.

A: The Refresh setting will only appear if your console and display support 120Hz over HDMI. 120Hz is only supported on Xbox One S and Xbox One X consoles, and while using a TV or monitor that supports 120Hz over HDMI. While some monitors support 120Hz over
DisplayPort, they may not support it over HDMI.

Please note that there is a bug in the 430 build that 120hz does not show if you meet these conditions but have the color depth set to anything BUT 8-bit. The new build today to Alpha (504 build) fixes this bug."

Hi,

Do you have the Xbox One, or the Xbox Series S? You'd be surprised how many people get the names confused.

If it's an Xbox One S, then that console doe not support 120Hz @ 4K. Also, the HDMI out on the Xbox One S is HDMI 2.0, not 2.1. Only the Xbox Series S and Series X support 4K @ 120Hz via the console settings. The One S is only 1080P.

Bear in mind also, that there are no games for the Xbox One S that do 120Hz (or 120 fps). The 120Hz option is only there to support VRR (variable refresh rate).

If you want to play 120Hz supported games, you will need a Series X. The Series S support of 120Hz games is a lot more limited.

Note that on the Qn95a, only HDMI 4 supports HDMI 2.1

Hi _wojdazeg_,

The xbox One S will connect to a 1440p /120hz monitor. However bare in mind that most games on the Xbox are capped to between 30 & 60hz.

Also your monitor would have to support 120hz/1440p over HDMI as the console does not have a displayport connector.

Xbox One S and X does not support 4K at 120hz and to get 4K at 120hz you need a HDMI 2.1 port on both console and TV,

also the Xbox One S is a 1080p console that upscales to 4K unlike the One X which is 4K console.

Hi,

There is more than enough bandwidth for 1440P @120Hz with HDR on an HDMI 2.0 Monitor. On the current consoles Microsoft decided to lock HDR to 4K displays, but with the Series S that won't be an issue anymore.

HDMI standards are backwards compatible, so you won't need an HDMI 2.1 compliant Monitor to use Series X or S on an older monitor or TV that only has HDMI 2.0.

Xbox One X and S can be very fussy when it comes to full monitor support. But if you bought a monitor that fully supports the Xbox One X then it should support the same features on a Series X/S.

My advice would be to check reviews of monitors actually running on the current consoles with 120Hz support. There are loads of videos on YouTube. Just looking at the specs on a website may not be enough.