‘HDMI 2.1’ TVs and cables may not be the real deal – here’s why

If you own a PS5 or Xbox Series X / S console, or are familiar with high-end 4K TVs or perhaps even one of the best 8K TVs, then you’ve likely come across HDMI 2.1. The newest cable standard supports quality features like dynamic HDR, variable refresh rate and auto low latency mode, as well as 4K video passthrough at 120Hz – except when it doesn’t.

As reported by Ars Technica, many HDMI 2.1 capable devices might not actually boast these high-end features, after all. That’s thanks to a quirk in the official HDMI guidelines – it turns out that the spec for HDMI 2.0 has been wholly replaced by HDMI 2.1, instead of simply building upon it.

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