Asus Z9PH-D16 - Manual (Page 46)

2-28 Chapter 2: Hardware information
5. 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.
6. Serial General Purpose Input/Output connector (8-1 pin ISGPIO1)
This connector is used for the SGPIO peripherals for the LSI MegaRAID and
Intel Matrix RAID SAS LED.This connector is used for SCU.