Asus X99-A II User Manual page 45

11. Thunderbolt header (5-pin TB_HEADER)
This connector is for the add-on Thunderbolt I/O card that supports Intel's Thunderbolt
Technology, allowing you to connect up to six Thunderbolt-enabled devices and a
DisplayPort-enabled display in a daisy-chain configuration.
The add-on Thunderbolt I/O card and Thunderbolt cables are purchased separately.
12. T_Sensor connector (2-pin T_SENSOR1)
This connector is for the thermistor cable that allows you to monitor the temperature of
your motherboard's critical components and connected devices.
The thermistor cable is purchased separately.
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