Asus WS C422 DC Manual page 32

13. M.2 socket (M.2_1(Socket 3))
This socket allows you to install M.2 SSD modules.
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The M.2 SSD module is purchased separately.
1-20
M.2_1 socket supports PCIe 3.0 x4 and SATA mode M Key design and type 2242 /
2260 / 2280 PCIe and SATA storage devices.
This sockets supports IRSTe (Intel Rapid Storage Technology enterprise).
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Chapter 1: Product Introduction