Asus P9D-C/4L - Manual (Page 50)

2-30 Chapter 2: Hardware information
The actual data transfer rate depends on the speed of Serial ATA hard disks installed.
2.8.2 Internal connectors
1. Serial ATA 6.0/3.0 Gbps connectors
(7-pin 6Gbps SATA1, SATA2, SATA3, SATA4 [Light Blue])
(7-pin 3Gbps SATA5, SATA6 [Black])
Supported by the Intel
® C224 chipset, these connectors are for the Serial ATA signal cables
for Serial ATA hard disk drives that allows up to 6Gbps 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.