Further, for 1440p monitors that don't support 4K input, there's just no way to get HDR at all. Further again, on HDMI 2.0 TVs/monitors, using 'Enable 4K' will cap the framerate to 60hz when a game decides to use it. So some games will output 1440p120 while others will output 4K60 HDR. You don't get much of a say in which do which. Not ideal.

No, HDMI 2.0 features will work with existing HDMI cables. Higher bandwidth features, such as 4K@50/60 (2160p) video formats, will require existing High Speed HDMI cables (Category 2 cables). bt2020 is supported by all cables (it's the chips that matter here, they need to be HDMI 2.0 I believe). K. kobeson Discussion starter.
Yes it does. So ik that 2.1 supports upto 48gbps, and after googling a bit i came to realize that 4k 120hz HDR takes 40.1gbps but no info for 144hz. That's only true for 8b/10b encoding, which is not what HDMI 2.1 uses. This is why calculations should be done with data rate, not transmission bandwidth. 4K 120 Hz 10 bpc with CVT-R2 timing uses
HDR is important to me. Does the GTX 970 support this standard of HDR for DolbyVision movies? I believe it needs HDMI 2.0a and the specs I see for 970 say 2.0, but I am not sure if a firmware/driver update allows 2.0a and the full HDR for movies?
It supports higher bandwidth, refresh rates, and improved compatibility with gaming consoles than previous versions. It also supports Dynamic HDR and eARC support for improved audio performance. HDMI 2.0 is the version preceding HDMI 2.1, and it has been around for a few years now. It supports static HDR, but with a lesser bandwidth. The switcher must also support HDMI handshake requirements implemented via the HDCP (High-bandwidth Digital Copy Protection) or HDCP 2.2 for 4K devices protocol between source devices and the TV or video projector. This is important when switching between devices, as there is a temporary break in the handshake until the newly selected device
Chosing the 4k/120 option does nothing under Ori outside of downscale the picture and remain at 59hz/60p (Freesync on/off). Halo remains at 4k UHD at 59hz/60p (Freesync on/off) with NO option to play at 120hz even when the dash is set to 1440p/1080p 120hz. There is no option under the settings to allow for 120hz.
The above said, HDR is a key feature in top-end models from name brands since 2016, so these HDR-capable models should have HDMI 2.0a inputs and support HDCP 2.2.
If you want to stream HDR content from an external device, you’ll need an HDMI port that supports the latest HDCP 2.2. This technology prevents unauthorized access to the content and is required Hdr support from Hdmi 2.0a and DP 1.4. Guide to Display Cables / Adapters (v2) Glenwings Guide to Display Cables / Adapters This is a guide intended to assist with the selection of cables and adapters.
Generally speaking though, if it has HDMI 2.0 yes it should be able to do 4K 60Hz 4:4:4 but it is best to know the details for the TV set you are interested in purchasing. Like others mentioned you need a GPU which can output the proper signal too, so a GPU with at least HDMI 2.0, preferably 2.0b.
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    • does hdmi 2.0 support hdr