Asus PRIME X299 Manual page 35

5. USB 2.0 connector
The USB 2.0 connector allows you to connect a USB module for additional USB
2.0 ports. The USB 2.0 connector provides data transfer speeds of up to 480 MB/s
connection speed.
DO NOT connect a 1394 cable to the USB connectors. Doing so will damage the
motherboard!
The USB 2.0 module is purchased separately.
6. Thermal Sensor connector
The Thermal Sensor connector allows you to connect a sensor to monitor the
temperature of the devices and the critical components inside the motherboard.
Connect the thermal sensor and place it on the device or the motherboard's component
to detect its temperature.
ASUS PRIME X299 EDITION 30 1-17