Asus P7F-C/SAS - 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 connectors (8-1 pin SGPIO2/3)
(P7F-C/SAS model only)
These connector is used for the SAS chip SGPIO interface that controls the
LED pattern generation, device information and general purpose data.