Asus RS161-E4/PA2 - Manual (Page 34)

Chapter 2: Hardware setup 2-18
2.8 SATA backplane cabling
Connects the SATAII cable from
SATA1 on the MB
Connects the SMBus
cable from the MB
Connects the fan cable
from FRNT_FAN4 on the MB
Connect the system fan cables
Connect the SATAII HDDs
Connects a 4-pin plug from
power supply
Connects the SATAII cable from
SATA2 on the MB