Asus M3N78-EH - 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 350mA~740mA (8.88W max.) or
a total of 1A~2.22A (26.64W 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.
Only CPU Fan connector supports Q-Fan function.
M3N78-EH Fan Connectors
R
M3N78-EH
CPU_FAN
GND
CPU FAN PWR
CPU FAN IN
CPU FAN PWM
CHA_FAN
GND
Rotation
+12V
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.
5. Optical drive audio in connector (4-pin CD)
This connector allows you to receive stereo audio input from sound sources
such as a CD-ROM, TV tuner, or MPEG card.
M3N78-EH Internal Audio Connector
R
M3N78-EH
CD
(black)
Right
Audio Channel
Lef
tA
udio Channel
Ground Ground