Asus Z9PR-D16 - Manual (Page 49)

ASUS Z9PR-D16 2-29
2. PSAS connectors (7-pin PSAS1, PSAS2, PSAS3, PSAS4, PSAS5, PSAS6,
PSAS7, PSAS8 [Blue])
This motherboard comes with eight (8) PIKE Serial Attached SCSI (PSAS)
connectors that supports both Serial Attached SCSI (SAS) and Serial ATA
(SATA). Each connector supports one device.
These connectors function only when you install a PIKE RAID card.