Asus WS C422 SAGE/10G Manual page 35

8. 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.
9. U.2 connectors (U.2_1-2)
This motherboard comes with U.2 connectors which support PCIe 3.0 x4 NVM Express
storage.
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