ASRock 990FX Extreme3 manual Ground pin, ATX Power Connector

Chassis and Power Fan Connectors					Please connect the fan cables
(4-pin CHA_FAN1)					to the fan connectors and
(see p.12	No. 21)				match the black wire to the
					ground pin. CHA_FAN1/2/3 fan
(3-pin CHA_FAN2)					speed can be controlled through
(see p.12	No. 20)				UEFI or AXTU.
(3-pin CHA_FAN3)
(see p.12	No. 10)
(3-pin PWR_FAN1)
(see p.12	No. 35)
CPU Fan Connectors					Please connect the CPU fan
(4-pin CPU_FAN1)					cable to the connector and
(see p.12	No. 4)				match the black wire to the
	1	2	3	4	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.

Pin 1-3 Connected

3-Pin Fan Installation

(3-pin CPU_FAN2)

(see p.12 No. 5)

ATX Power Connector 12 24

(24-pin ATXPWR1)

(see p.12 No. 9)

1 13

Please connect an ATX power supply to this connector.

Though this motherboard provides 24-pin ATX power connector,	12	24
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.
20-Pin ATX Power Supply Installation 1		13

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