I recently bought the latest AppleTV 4K and was also concerned about which HDMI cable would be best.
Found several sources that said (basically) if you have a cable that produces a picture instead of a black screen, you’re good.
I ended up experimenting with one of the several HDMI cables I had lying around, and it worked beautifully (picture switching between formats depending on format of incoming stream, etc.).
I recently bought the latest AppleTV 4K and was also concerned about which HDMI cable would be best.
Found several sources that said (basically) if you have a cable that produces a picture instead of a black screen, you’re good.
I ended up experimenting with one of the several HDMI cables I had lying around, and it worked beautifully (picture switching between formats depending on format of incoming stream, etc.).
Don’t sweat it.