Asus RS300-E7/RS4 - Manual (Page 56)

Chapter 4: Motherboard information 4-10
3. Hard disk activity LED connector (4-pin HDLED1)
This LED connector is for the storage add-on card cable connected to
the SATA or SAS add-on card. The read or write activities of any device
connected to the SATA or SAS add-on card causes the front panel LED to
light up.
2. SAS connectors
(7-pin SAS1, SAS2, SAS3, SAS4 [Blue])
(7-pin SAS5, SAS6, SAS7, SAS8 [Black])
This motherboard comes with eight (8) Serial Attached SCSI (SAS) connectors,
the next-generation storage technology that supports both Serial Attached
SCSI (SAS) and Serial ATA (SATA). Each connector supports one device.
• These connectors function only when you install a PIKE RAID card.
• Connect the SAS hard disk drives to SAS connectors 1–4 (blue) when
installing a 4-port PIKE RAID card.