The USB-C to HDMI 2.1 8K Cable supports a wide range of resolutions and refresh rates: 8K at 60Hz, 4K at 120Hz, 4K at 60Hz, 2K at 240Hz, and 1080p at 500Hz. On Mac computers it supports up to 4K at 60Hz. Your actual resolution and refresh rate depend on what your host device and monitor or TV support.