Asus RS300-H8-PS12 - Manual (Page 62)

Chapter 4: Motherboard information 4-14
8. Serial General Purpose Input/Output connector (6-1 pin SGPIO1)
The SGPIO 1 connector is used for the Intel Rapid Storage Technology Enterprise SGPIO
interface that controls the LED pattern generation, device information, and general
purpose data.
Serial General Purpose Input/Output connectors (8-1 pin SGPIO2, SGPIO3)
The SGPIO 2 and SGPIO 3 connectors are for the LSI 2308 RAID controller.