We can kindly confirm that when using this cable on macOS, this cable will be limited to only support 4K at 60Hz and will not support anything above this frame rate. Macs are designed to only support refresh rates of 5K or 6K when connected directly through a Thunderbolt connection and not HDMI. Due to this limitation, you Mac will only allow for the HDMI cable to output 4K resolution, even though this cable is rated to reach 8K on supporting host devices and monitors.
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