ASROCK M3A790GMH/128M User Manual download pdf (Page 29)

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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 Power Connector Please connect an ATX power

(24-pin ATXPWR1) supply to this connector.

(see p.13 No. 8)

Chassis and Power Fan Connectors Please connect the fan cables

(3-pin CHA_FAN1) to the fan connectors and

(see p.13 No. 15) match the black wire to the

ground pin.

(3-pin PWR_FAN1)

(see p.13 No. 10)

G ND

+12V

C HA_FAN_SPEED

CPU Fan Connector Please connect the CPU fan

(4-pin CPU_FAN1) cable to this connector and

(see p.13 No. 3) match the black wire to the

ground pin.

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 Fan Installation

Pin 1-3 Connected

GND

+12V

CPU_FAN_SPEED

FAN_SPEED_CONTROL

GND

+12V

PWR_FAN_SPEED

20-Pin ATX Power Supply Installation

Serial port Header This COM1 header supports a

(9-pin COM1) serial port module.

(see p.13 No.27)

CCTS#1

DDS R#1

DDTR#1

RRXD1

DDCD#1

TTXD1

GND

RRTS #1

RRI#1

ATX 12V Power Connector Please connect an ATX 12V

(4-pin ATX12V1) power supply to this connector.

(see p.13 No. 2)

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ASROCK M3A790GMH/128M User Manual Page 29

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