HDMI 2.1 spec has support for VRR, 10K resolution, and Dynamic HDR
 

HDMI 2.0 ouputs and their support for 3840x2160 resolution at 60 Hz are still not ubiquitous even on brand-new PCs. As an example, the UHD Graphics unit included in Intel's latest eighth-generation Core processors needs help from a converter chip to achieve that resolution and refresh rate. The HDMI Forum is nevertheless charging ahead and has released the HDMI 2.1 specification. The new spec includes support for resolutions up to 10K (10240x4320) at refresh rates up to 120 Hz. The mandatory Ultra High Speed HDMI cable can now carry up to 48 Gbps and allows for Display Strem Compression (DSC).

Among other features, HDMI 2.1 also supports variable refresh rates, an automatic low-latency mode, and HDR metadata. HDR support is extended from a using a single image descriptor for an entire piece of content to ...

https://techreport.com/news/32888/hd...nd-dynamic-hdr