Is HDR possible when 120hz is active along with 1440p/1080p over HDMI 2.0?

It depends on what resolution your going to play at and the resolution of the tv,

if 4K, you need HDMI 2.1 to get 4K at 120hz refresh rate,

HDMI 2.0 will only allow 4K at 60hz.

if your at 1080p/1440p, HDMI 2.0 will be ok for 120hz refresh rate, however if it is 1080p/1440p i would recommend getting the Xbox Series S as that is aimed at 1080p/1440p.

for 120hz you need i think hdmi2.1.

besides connecting the s at 120hz is not going to magically let it run at 120fps, you will be lucky to get 40fps on most games. kills my eyes running so slow.

HDMI 2.1 is only needed if you plan to game at 4K for 120hz , on a 4K 144hz monitor, However there's no gaming monitors available at the moment, that yet has HDMI 2.1, the first HDMI 2.1 monitors that are likely to come in are around the same time as the
Series X (Q4) launch or early 2021 (Q1),

1080p and some 1440p monitors can do 120hz over HDMI 1.4 if it's supported, but best ideally is HDMI 2.0 for 1440p for 120hz,

HDMI 2.0 can do 1080p / 1440p at 120hz and 4K at 60hz,

HDMI 2.1 can do 1080p / 1440p / 4K at 120hz.

For the Xbox Series X, it best to get a 4K TV or monitor that supports 120hz and has HDMI 2.1, to get the full potential out of the Series X.

Wow yes your correct. Got my ports mixed up.

On PC I did test the HDMI 2.0 port, and im able to get 120hz and 144hz at 1440p.

The Xbox on the other hand will only allow me to choose 120hz at 1080p. When I choose 1440p it only allows 60hz.

Thanks for informing me on the HDMI 2.0 port.

While 1440P 120Hz and HDR is still well within the bandwidth for this resolution on HDMI 2.0, currently Microsoft has locked HDR behind 4K resolutions. With your display being 1440P and HDMI 2.0, selecting 'Allow 4K' would limit you to 60Hz.

There is a website to submit your idea https://www.reddit.com/r/xboxinsiders/wiki/ideas/

That doesnt answer the question is it going to work for older monitors that are hdmi 2.0 that didn't run at the 1440p 120hz they were supposed to run at on xbox one x i bought a viotek monitor gft27db was supposed to run 1440p 120hz over the hdmi 2.0 but
it doesn't on the one x only runs at 1080p 120hz with freesync on or 1440p 60hz no freesync will series x solve this issue thats what he wants to know i have heard it was a bandwidth issue but with the new console having higher bandwidth i would guess it would
solve the issue but would like to know for sure