Asus MAXIMUS VIII EXTREME User Manual page 64

12. T_Sensor connectors (2-pin T_SENSOR1-3)
This connector is for the thermistor cable that allows you to monitor the temperature of
your motherboard's critical components and connected devices.
13. M.2 (Socket 3)
The M.2 (Socket 3) with M Key supports type 2242 (22mm x 42mm), 2260 (22mm x
60mm), 2280 (22mm x 80mm), and 22110 (22mm x 110mm) PCIe/SATA interface
storage devices.
When the M.2 (Socket 3) is operating in SATA mode, SATA Express1 will only support
PCIe mode (SATA6G will be disabled).
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Chapter 1: Product Introduction