Asus M4A77T/USB3 - Manual (Page 29)

6. USB 2.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for
USB 2.0 /1.1 devices.
7. USB 3.0 ports 1 and 2. These two 4-pin Universal Serial Bus (USB) ports are for USB
3.0 / 2.0 devices.
8. USB 2.0 ports 3 and 4. These two 4-pin Universal Serial Bus (USB) ports are for USB
2.0 / 1.1 devices.
9. Serial port. This 9-pin COM1 port is for pointing devices or other serial devices.
10. Optical S/PDIF_OUT port. This port connects to an external audio output device via
an optical S/PDIF cable.
11. PS/2 Keyboard port (purple). This port is for a PS/2 keyboard.
1.10.2 Internal connectors
1. CPU and chassis fan connectors (4-pin CPU_FAN, and 3-pin CHA_FAN)
Connect the fan cables to the fan connectors on the motherboard, ensuring that the
black wire of each cable matches the ground pin of the connector.
Only the 4-pin CPU fan supports the ASUS Q-Fan feature.
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.
CPU_FAN
GND CPU
FA
N PWR
CPU
FA
N IN
CPU
FA
N PWM
M4A77T/USB3
M4A77T/USB3 fan connectors
Rotation
+12V
GND
CHA_FAN
ASUS M4A77T/USB3 1-19