Asus TS300-E7/PS4 - Manual (Page 65)

ASUS TS300-E7/PS4 4-13
7. Serial General Purpose Input/Output connector (6-1 pin SGPIO1)
This connector is used for the SGPIO peripherals for the Intel Rapid Storage
Technology RAID SATA LED.
8. Serial General Purpose Input/Output connectors (8-1 pin SGPIO2/3)
These connectors are used for the SAS chip SGPIO interface that controls
the LED pattern generation, device information and general purpose data.
These connectors function only when you install an ASUS PIKE SAS RAID
card.