Asus P9D-MV - Manual (Page 54)

2-34 Chapter 2: Hardware information
4. USB 3.0 connector (20-1 pin USB3_34)*
These connectors allow you to connect a USB 3.0 module for additional
USB 3.0 front or rear panel ports. With an installed USB 3.0 module, you can
enjoy all the benefits of USB 3.0 including faster data transfer speeds of up
to 5Gbps, faster charging time for USB-chargeable devices, optimized power
efficiency, and backward compatibility with USB 2.0.
5. Thermal sensor cable connectors (3-pin TR1)
This connector allows you to connect a Thermal sensor cable that is used for
temperature monitoring. Connect the Thermal sensor cable to the connector
and place its probe to the device that you want to check the temperature.
*For P9D-M motherboard only