https://wccftech.com/new-apple-tv-4k-supports-4k-hdr-at-120-fps-but-apple-did-not-unlock-it/

Apple launched the new 2021 Apple TV 4K at its Spring Loaded event last month. Apparently, the company did not bring any major design changes to the set-top box but equipped it with a powerful processor. However, the Siri Remote received its major update and it now looks pretty neat. While the powerful chip is a much welcome addition, reviewers suggest that Apple has yet to unlock its full potential. The 2021 Apple TV 4K comes with HDMI 2.1 which allows the device to support 4K HDR at 120 fps.

As per Sigmund Judge from Screentimes, HDMI 2.1 is the latest connectivity standard in the industry. The update from HDMI 2.0 opens up a whole lot of possibilities all thanks to the faster data transfer speeds up to 48gbps. The faster data transfer speeds allow the Apple TV 4K to support $K HDR content at 120 fps for gaming and media content. However, it seems Apple has not enabled or unlocked the new feature yet.