ASROCK H77M User Manual page 34

Chassis and Power Fan Connectors
CHA_FAN_SPEED
(4-pin CHA_FAN1)
(see p.13, No. 22)
(3-pin CHA_FAN2)
(see p.13, No. 31)
PWR_FAN_SPEED
(3-pin PWR_FAN1)
(see p.13, No. 32)
CPU Fan Connectors
(4-pin CPU_FAN1)
(see p.13, No. 2)
FAN_SPEED_CONTROL
Though this motherboard provides 4-Pin CPU fan (Quiet Fan) support, the 3-Pin
CPU fan still can work successfully even without the fan speed control function.
If you plan to connect the 3-Pin CPU fan to the CPU fan connector on this
motherboard, please connect it to Pin 1-3.
(3-pin CPU_FAN2)
(see p.13, No. 3)
ATX Power Connector
(24-pin ATXPWR1)
(see p.13, No. 6)
Though this motherboard provides 24-pin ATX power connector,
it can still work if you adopt a traditional 20-pin ATX power supply.
To use the 20-pin ATX power supply, please plug your
power supply along with Pin 1 and Pin 13.
ATX 12V Power Connector
(8-pin ATX12V1)
(see p.13, No. 1)
Please connect the fan cables
to the fan connectors and match
+12V
FAN_SPEED_CONTROL
the black wire to the ground pin.
GND
CHA_FAN1 and CHA_FAN2
supports Fan Control.
+12V
GND
Please connect the CPU fan
4 3 2 1
cable to the connector and
GND
match the black wire to the
+12V
CPU_FAN_SPEED
ground pin.
Pin 1-3 Connected
Please connect an ATX power
12 24
supply to this connector.
1 13
20-Pin ATX Power Supply Installation
Please connect an ATX 12V
5 1
power supply to this connector.
8 4
34
3-Pin Fan Installation
12 24
1 13