Asus Z9NH-D12 - Manual (Page 52)

2-30 Chapter 2: Hardware information
The actual data transfer rate depends on the speed of SATA hard disks installed.
2. SATA connectors — ISAS connectors (7-pin ISAS1–4 [Gray])
Supported by Intel C602 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.