Orin nx 8G development board, using HDMI output, linked to 4K display, can only recognize high-definition signals?

Orin nx 8G development board, uses HDMI output, links to 4K displays, only supports 1920* 1080@60 I used a special device and changed it to 3840 * 1080, which can only output 30Hz; If configured at 60Hz, it cannot be displayed; That is to say, my HDMI can only output a bandwidth of less than 165M. May I ask why?

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