Asus P5G-MX - Manual (Page 40)

1-28 Chapter 1: Product introduction
4. CPU and Chassis fan connectors (4-pin CPU_FAN, 3-pin CHA_FAN)
The fan connectors support cooling fans of a total of 1A~2.2A (26.4W max.)
at +12V. Connect the fan cables to the fan connectors on the motherboard,
making sure that the black wire of each cable matches the ground pin of the
connector.
Do not forget to connect the fan cables to the fan connectors. Insufficient air
flow inside the system may damage the motherboard components. These are
not jumpers! DO NOT place jumper caps on the fan connectors.
P5G-MX
R
P5G-MX Fan Connectors
CPU_FAN
GND
+12V
CPU FAN IN
CPU FAN PWM
CHA_FAN
GND
Rotation
+12V
5. Digital Audio connector (4-1 pin SPDIF_OUT)
This connector is for the S/PDIF audio module to allow digital sound output.
Connect one end of the S/PDIF audio cable to this connector and the other
end to the S/PDIF module.
The S/PDIF out module is purchased separately.
P5G-MX
R
P5G-MX Digital Audio Connector
+5V SPDIFOU
T
GND
SPDIF_OUT