HDMI is backwards compatible but only to the in-common option sets. That means if you have and HDMI 2.1 device connected to an HDMI 2.0 device, the only options that will work without issues are the ones that are part of the HDMI 2.0 options. 1080 (HD) is not an issue but once you move up to 4k, 4k HDR, and beyond distance becomes critical, as It has a higher maximum bandwidth compared to HDMI 2.1, almost tripling that of DisplayPort 1.4 at 77.73Gbps. Related: HDR Formats Compared: HDR10, Dolby Vision, HLG, and Technicolor. The trouble is, there is a distinct lack of monitors that are compatible with DisplayPort 2.0, and few affordable HDMI 2.1 monitors are available. The LG OLED65E9 TV is equipped with HDMI 2.1 controllers. As well as providing a maximum bandwidth of 48 Gbps compatible with video resolutions and refresh rates that are a lot higher than the HDMI 2.0 standard (up to 8K 50/60 FPS and 4K 100/120 FPS), the HDMI 2.1 standard also offers two new features for gamers: VRR and ALLM. eARC or Enhanced Audio Return Channel is an upgraded version of ARC (Audio Return Channel). It was introduced in 2017 as a part of the HDMI 2.1 specification. Similar to ARC, eARC lets your TV send audio generated by built-in streaming apps, cable, satellite, and other source devices (for example, a gaming console or a Blu-Ray player) to your HDMI 2.0 supports a maximum refresh rate of 60Hz at 4K resolution. With 4:4:4 chroma subsampling, the refresh rate may go as high as 144 Hz. In such regards, HDMI 2.1 is better as it allows for the output of videos in 4K resolution at 120fps and 8K resolution at 60fps. At 4K resolution, HDMI 2.1 supports a maximum refresh rate of 120Hz, which Its maximum data transmission rate is 48.0 Gbit per second, or six gigabytes per second. That is more than twice the bandwidth of HDMI 2.0. Your current TV almost certainly does not support HDMI 2.1. According to a couple of reports, the first HDMI 2.1 cable is already available: a Belkin cable, currently priced at $29.95. The trick, apparently, is to look for cables marked "Ultra High Speed Version HDMI 2.1b of the HDMI Specification is backward compatible with earlier versions of the Specification and is available to all HDMI 2.0 Adopters. Supporting Materials Supporting graphics, photos, and multi-language overview presentations on HDMI 2.1b are available for download and reproduction . .

is hdmi 2.0 compatible with hdmi 2.1