Sata_ex1: sata express connector, M2_1: m.2 port, M2_1 – MSI X99S SLI PLUS Manual User Manual
Page 38: M.2 port, Sata_ex1, Sata express connector, Chapter 1, Video demonstration, Important, 24 getting started

Chapter 1
1-24
Getting Started
SATA_EX1: SATA Express Connector
The SATA Express, a new high performance storage interface, supports to connect 1
SATA Express device with up to 10 Gb/s transfer rate. Connects the SATA Express
device to this 3-in-1 connector by a SATA Express cable.
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M2_1: M.2 Port
The M.2 port supports either M.2 SATA 6Gb/s module or M.2 PCIe module.
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Video Demonstration
Watch the video to learn how to install M.2 module.
http://youtu.be/JCTFABytrYA
Important
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The SATA Express port/ SATA5~6 ports will be unavailable when installing the M.2
SATA interface module in the M.2 port.
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Intel RST does not support PCIe M.2 SSD with Legacy ROM.
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M.2 PCIe interface does not support RAID 0, RAID1, RAID 5 and RAID 10.
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Always turn off the power supply and unplug the power cord from the power outlet
before installing or removing the M.2 module.