Asus Z9NR-D12 User Manual page 54

7. Serial General Purpose Input/Output connectors
(8-1 pin PSGPIO 1/2, ISGPIO1, SGPIO1)
The SGPIO 1 connectors are used for the Intel Rapid Storage Technology
Enterprise SGPIO interface that controls the LED pattern generation, device
information and general purpose data.
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The PSGPIO 1/2 connectors are used for PIKE card.
The ISGPIO 1 connector is for SATA connectors—ISAS connectors.
Chapter 2: Hardware information