Asus P7F-X SATA - Manual (Page 45)

ASUS P7F-X Series 2-27
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. Serial ATA connectors (7-pin SATA1, SATA2, SATA3, SATA4; RED)
(P7F-X/SATA model only)
Supported by the Marvell
® 88SE6145 chipset, these connectors are for the
Serial ATA signal cables for Serial ATA hard disk drives that allows up to
3Gb/s of data transfer rate.
If you installed Serial ATA hard disk drives, you can create a RAID 0, RAID 1,
RAID 10, or RAID 5 configuration.