The DA300 USB-C Mobile Adapter does not support 4K resolution at 60Hz through HDMI or DisplayPort on ALL Dell systems. The default output on unsupported systems is 4K at 30Hz.
To determine if your system supports 4K at 60Hz:
- Check your monitor specifications to see whether it supports 4K resolution at 60Hz through DisplayPort or HDMI.
- Check your system specifications to see whether it supports the DisplayPort 1.3 /1.4 standard.
If both of these conditions are not met, your system is unsupported, and 4K resolution will display at 30Hz.