1.10.2 Internal connectors Asus prime Asus M3A78

Page: 34 from 58

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8. 

USB connectors (10-1 pin USB78, USB910, USB1112)
These connectors are for USB 2.0 ports. Connect the USB module cable to any of 

these connectors, then install the module to a slot opening at the back of the system 

chassis. These USB connectors comply with USB 2.0 specification that supports up to 

480 Mbps connection speed.

Never connect a 1394 cable to the USB connectors. Doing so will damage the 

motherboard!

The USB 2.0 module is purchased separately.

R

M3A78

M3A78 USB 2.0 Connectors

USB78

USB+5V USB_P8

-

USB_P8

+

GN

D

NC

USB+5V USB_P7

-

USB_P7

+

GN

D

1

USB910

USB+5V USB_P10- USB_P10+ GN

D

NC

USB+5V USB_P9

-

USB_P9

+

GN

D

1

USB1112

USB+5V USB_P12- USB_P12+ GN

D

NC

USB+5V USB_P1

1-

USB_P1

1+

GND

1

9. 

CPU, Chassis, and Power Fan connectors (4 pin CPU_FAN, 3-pin CHA_FAN, 

3_pin PWR_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, ensuring 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.

Only the CPU FAN supports ASUS Q-Fan.

M3A78 Fan Connectors

R

M3A78

CPU_FAN

GN

D

CPU 

FA

N PW

R

CPU 

FA

N IN

CPU 

FA

N PW

M

CHA_FAN

GN

D

Rotation

+12V

PWR_FAN

GN

D

Rotation

+12V

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ASUS M3A78