This cable is great but I can't test 4k at 120hz or 8k at 60hz. I have a new MacBook Pro M1 with USB4 and an 8K TV. Unfortunately I don't know what the problem is as the HDMI2.1 support seems vague. What exactly works: 2016 Macbook Pro TB3 4K@60hz2020 Macbook Pro USB4 4K@60hz
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