Asus KGPE-D16 - Manual (Page 56)

2-36 Chapter 2: Hardware information
7. Serial General Purpose Input/Output connectors (8-1 pin SGPIO1/2)
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.
8. Serial General Purpose Input/Output connectors (8-1 pin SGPIO3/4)
These connectors are used for the SGPIO peripherals of the PROMISE ®
RAID SATA LED.