Asus ESC4000 G2 - Manual (Page 64)

4-8 Chapter 4: Motherboard information
4.3 Internal connectors
1. Serial ATA 6.0/3.0 Gb/s connectors (7-pin SATA6G1-2 [blue]; 7-pin SATA3G
3-4 [black])
These connectors connect to Serial ATA 6.0Gb/s or 3.0 Gb/s hard disk drives
and optical disc drives via Serial ATA 6.0Gb/s or 3.0 Gb/s signal cables.
The actual data transfer rate depends on the speed of Serial ATA hard disks
installed.