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The number "120" is currently moving the world. Well, at least the apple one, when it is always connected to the display. Specifically, of course, it is the 120Hz adaptive refresh rate not only of the iPhone 13 Pro, but also of the new 14 and 16" MacBook Pros. It was just a little forgotten that it was also discussed in connection with the Apple TV 4K, which Apple presented to us in the spring of this year.

Of course, the Apple TV 4K is not equipped with any display. Its purpose, however, is to connect it to something – ideally to a TV, of course. As one of its main novelties, which the new generation of this Apple smart box brought, is HDMI 2.1 support.

HDMI specification 

As they say in Czech Wikipedia, so HDMI (High-Definition Multimedia Interface) stands for uncompressed video and audio signal in digital format. It can connect, for example, a satellite receiver, DVD player, VCR/VHS player, set-top box or computer to a compatible display device such as a TV or monitor that is equipped with an HDMI connector. And it is an alternative for DisplayPort. 

HDMI 2.1 also referred to as HDMI ULTRA HIGH SPEED, which was introduced on November 29, 2017, and its specifications are as follows: 

  • Throughput up to 48 Gb/s 
  • Support 8K at 60 Hz and 4K at 120 Hz and resolutions up to 10K 
  • Dynamic HDR formats are also supported 
  • eARC simplifies connectivity 

Incomprehensible shortening of functionality 

Even though HDMI 2.0 support in MacBooks Pro is widely discussed, when on the one hand its presence is celebrated, on the other hand its lower designation is criticized, it still has the option of connecting to an external display via its USB-C/Thunderbolt ports. In contrast, of course, you can connect the Apple TV 4K to a television and, thanks to the included port, also an appropriately high-quality television. At least that's how it looks on paper, because the situation is actually different. Yes, Apple TV 4K could do 4K at 120Hz refresh rate if Apple allowed it.

If you look into technical specifications product, you will read that Apple TV 4K is compatible with HD and UHD televisions with HDMI interface, which is linked to the footnote. And it talks about supporting 4K HDR video output at up to 60 frames per second. Pretty bad luck. So the hardware could do it, but for an unknown reason, Apple limits the functionality of this product. It didn't seem like a drawback after the show, hoping for a future update. But she still doesn't come. So if you have a 4K TV with 120Hz refresh rate capability, you just won't get it with Apple TV 4K. 

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