Power supplyunit

Pin 10 is used for both main 12V Power and the optional Voltage Sensing wire for the power supply to provide the correct voltage to the motherboard. Voltage Sensing Pin details in Section 4.2.3.

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ATXpower supplySpecification

For a sense pin that needs to be grounded, it must be connected to ground either directly in the power supply or via a jumper to an adjacent ground pin in the connector.

If a power supply uses a modular cable connection, an additional 12V-2x6 PCB Header connector will be required in the housing of the power supply to accept “double-ended” 12V-2x6 cables. Details below are provided via the PCIe* CEM Revision 5.1 Specification.

If board power requirements are higher than what can be provided by the 10 pin Main Board Connector, the Extra Board Power connector can be used. This connector can provide an additional 216-288 watts of power to the motherboard to support multiple PCIe* connectors, multiple USB ports, or other expansion slots.

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The 12VHPWR connector, introduced in the earlier 2.0 revision of this document and the PCIe* CEM 5.0 Specification, has been deprecated and replaced with the 12V-2x6 connector, as shown in th PCIe* CEM 5.1 specification. While the 12V-2x6 connector specification is mechanically identical to the 12VHPWR connector in most respects, multiple updates have been incorporated into the newer, 12V-2x6 connector, to improve its reliability.

ATXpower supplypinout

Since the Extra Board Connector is optional on the motherboard and is expected to be needed only for higher power motherboards, this can be correlated to PSU size. Therefore, this connector is only required on PSU that are greater than 450 Watts. It is optional on PSU that is equal to or less than 450 Watts.

There are no specific requirements for output wire harness lengths, as these are largely a function of the intended end-use chassis, motherboard, and peripherals. Ideally, wires should be short to minimize electrical/airflow impedance and simplify manufacturing, yet they should be long enough to make all necessary connections without any wire tension (which can cause disconnections during shipping and handling). The recommended minimum harness length for general-use power supplies is 150 mm for all wire harnesses. That is very short, and most power supplies need wire harness cables longer than 150mm, consider market conditions and chassis sizes for power supply market wire harness lengths. Measurements are made from the exit port of the power supply case to the wire side of the first connector on the harness.

12VHPWR pinout

The mating pilers are unique to this design, refer to figure below. Note connector color can be changed work with connector companies to see what they provide. Motherboard connector color is recommended to be white to show that power into the board is different color than power going out of the board (3 mm SATA Power Connector), which is recommended to be black.

Table 5-2: Main Power Connector Pin-Out shows pin outs and profiles for typical power supply DC harness connectors. The power supply requires an additional two-pin, power connector.

Main Power Connector for motherboard with control and standby rail connections are required. Smaller board sizes can only use this connector.

The 12V-2x6 Auxiliary Power connector is designed to deliver up to 600 watts of 12V power directly to a PCIe* Add-in Card. This power connector is not compatible with the 2x3 or 2x4 auxiliary power connectors. The 12V-2x6 connector power pins have a 3.0 mm spacing while the contacts in a 2x3 and 2x4 connector lie on a larger 4.2 mm pitch. The 12V-2x6 auxiliary power connector includes twelve large contacts to carry power and four smaller contacts beneath, to carry the sideband signals.

Power supply

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This connector has the same mechanical and electrical characteristics as the PCIe* 2x3 Auxiliary Power Connector, detailed in Section 5.2.2.4.1.

SATAPower

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The 12V-2x6 cable plug housing has been defined with two options that provide different physical shroud designs for the sideband signals, as shown in Figure 5-4. The thumb-ridge feature is present on one design (Option 1) and absent on the other (Option 2).

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These are optional connectors for the power supply to support additional power needed by any PCI Express* Add-in Card (AIC). The most common PCIe* Add-in Card that uses these connectors are discrete graphics cards. The PCIe* CEM Specification defines different connectors based on the power used by the Add-in Card which can range from 75 watts up to 600 watts.

This connector may be provided by other connector companies beyond what is listed above. Contact the preferred connector provider for details. Below is the key for this connector, from motherboard connector view. 18 AWG is recommended for all wires. Connector needs to support 8 amps per pin.

The 2x4 Auxiliary Power Connector consists of a PCB Header, mounted on a PCIe* Add-in Card, and a mating 2x4 Cable Plug harness. The 2x4 PCB header is designed to accept both the mating 2x4 Cable Plug as well as the 2x3 cable plug, for backward-compatibility. The Add-in Card PCB Header is keyed to ensure that a 2x3 cable plug from a PSU will be properly aligned when it is mated with a 2x4 PCB Header. Two Sense pins in the 2x4 PCB header allow the PCIe* Add-in Cards to detect the power available from the cable. The 2x4 Cable Plug asserts (grounds) two sense pins to indicate that 150 watts are available to the PCIe* Add-in Card through this cable, while the 2x3 plug asserts only one sense pin, to signal that only 75 watts may be drawn from the cable. The 2x4 Cable Plug has the following requirements:

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Crimp Contacts inside of the cable plug are can either use the 4-Spring design, 3-dimple design (as shown in Figure 5-11), or equivalent design. Any design is required to meet the design and reliability requirements that are needed to provide the high current per pin of the 12V-2x6 connector. Whether using the 4-Spring, 3-Dimple Design, or equivalent; the design criteria recommended for these mechanical connections are listed below:

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Recommended for PSU designed for High End Desktop and Gaming systems that might need 12V power for Fans, LEDs, or Liquid Cooling pumps. Only populate pins 1 and 2.

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The 12V-2x6 PCB connector is labeled with a “H++” to differentiate it from the previously defined 12VHPWR connector, which was labelled with the “H+” symbol.

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This power connector is designed as the main board connector and for smaller to medium size boards this is the only connector that is needed. This connector can provide up to 216 to 288 watts of power using the assumption that each pin can provide 6–8 Amps. Board designers need to figure out total board power and if this single connector provides enough power for each board.

The cable plug connector housing for the 12V-2x6 connector has all dimensions shown in mm. Slight changes to this connector that do not affect connector mating are permitted. Reference latest PCI-SIG documentation for latest information about this connector.