Asus RS300-E8-PS4 User Manual page 58

5. 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.
6. Thermal sensor cable connectors (3-pin TR1)
This connector allows you to connect a Thermal sensor cable that is used for
monitoring temperature. Connect the Thermal sensor cable to the connector
and place its probe to the device that you want to monitor.
4-10 Chapter 4: Motherboard information