Asus P5Q3 - Manual (Page 56)

2-30 Chapter 2: Hardware information
8. CPU, chassis, and power fan connectors (4-pin CPU_FAN, 3-pin
CHA_FAN1-2, 3-pin PWR_FAN)
The fan connectors support cooling fans of 350 mA~2000 mA (24 W max.)
or a total of 1 A~6 A (72 W 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!
9. Optical drive audio 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.
• Only the CPU-FAN and CHA-FAN 1-2 connectors support the ASUS Q-Fan
feature.
• If you install two or more VGA cards, we recommend that you plug the
rear chassis fan cable to the motherboard connector labeled CHA_FAN1,
CHA_FAN2 for better thermal environment.