Microsoft P4X4-ALH CPU Fan and Chassis Fan Connectors, Connector CN13 FAN1/CN17 FAN2 Type Pin

	Hardware Installation
2.5.4. CPU Fan and Chassis Fan Connectors
Connector:	CN13 (FAN1)/CN17 (FAN2)
Type:	3 pin

The cooling fans must be connected to their respective power connectors. If you have installed the hardware-monitoring feature you will be able to monitor the rotating speed of the CPU cooling fan in your Windows operating system.

Top View of a Fan Connector		Front View of a Fan Connector
1	Ground		+12V DC
2	+12V DC
		Fan Signal	Ground
3	Fan Signal
2.5.5. ATX Power Supply Connectors
Connector:	CN15-A/CN15-B/CN15-D
Type:	20 pin block/2x2 12V/1x4 AUX12V

The mainboard comes with three onboard power supply connectors labeled CN15-A, CN15-B and CN-15D. CN15-A and CN15-B are regular ATX12V power supply connectors. CN15A and CN15D are regular ATX power supply connec- tors. The auxiliary power supply connector (CN15-D) is for a +12V and +5V power supply. These increased power supplies are necessary to provide extra power for the slot. The ATX 12V power supplies are all downward compatible with standard ATX power supplies.

ATX Connectors Pin Assignments

		CN15-A				CN15-B
Pin 1	+3.3VDC		Pin 11	+3.3VDC	Pin 1	COM
Pin 2	+3.3VDC		Pin 12	-12VDC	Pin 2	COM
Pin 3	COM		Pin 13	COM	Pin 3	+12VDC
Pin 4	+5VDC		Pin 14	PS_ON#	Pin 4	+12VDC
Pin 5	COM		Pin 15	COM
						CN15-D
Pin 6	+5VDC		Pin 16	COM	Pin 1	+12VDC
Pin 7	COM		Pin 17	COM	Pin 2	COM
Pin 8	PWR_OK		Pin 18	-5VDC	Pin 3	COM
Pin 9	+5VSB		Pin 19	+5VDC	Pin 4	+5VDC
Pin 10	+12VDC		Pin 20	+5VDC

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The P4X4-ALH Mainboard