Asus Z8NA-D6 - Manual (Page 54)

2-34 Chapter 2: Hardware information
8. Serial General Purpose Input/Output connector (6-1 pin SGPIO1)
This connector is used for the SGPIO peripherals for the LSI MegaRAID and
Intel Matrix RAID SATA LED.
9. Serial General Purpose Input/Output connectors (8-1 pin SGPIO2/3)
(Z8NA-D6 model only)
These connector is used for the SAS chip SGPIO interface that controls the
LED pattern generation, device information and general purpose data.
These connectors functions only when you install an ASUS PIKE SAS RAID
card.