Asus ESC4000 G2 - Manual (Page 65)

ASUS ESC4000 G2 Series 4-9
2. SATA connectors — ISAS connectors (7-pin ISAS1–4 [Blue])
Supported by the Intel ® C602-A PCH, ISAS 1-4 connectors connect to Serial ATA
3.0 Gb/s hard disk drives and optical disk drives via Serial ATA 3.0 Gb/s signal
cables.
The actual data transfer rate depends on the speed of SATA hard disks
installed.