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Intel Desktop Board D925XCV/D925XBC Technical Product Specification
2.8.2.1 Power Supply Connectors
The board has three power supply connectors:
• Main power – a 2 x 12 connector. This connector is compatible with 2 x 10 connectors
previously used on Intel Desktop boards. The board supports the use of ATX12V power
supplies with either 2 x 10 or 2 x 12 main power cables. When using a power supply with a
2 x 10 main power cable, attach that cable on the rightmost pins of the main power connector,
leaving pins 11, 12, 23, and 24 unconnected.
• ATX12V power – a 2 x 2 connector. This connector provides power directly to the processor
voltage regulator and must always be used. Failure to do so will prevent the board from
booting.
• Alternate power – a 1 x 4 connector. This connector provides additional power when using
high wattage PCI Express x16 graphics cards.
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INTEGRATOR’S NOTE
When using high wattage PCI Express x16 graphics cards, use one of the following power supply
configurations to avoid system instability:
• The preferred method of power delivery is to use a power supply with a 2 x 12 main power
cable. In this configuration, use two connectors to provide power to the board:
The main power connector
The ATX12V connector
In this configuration, the alternate power connector is not required. The 2 x 12 main power
cable can provide up to 144 W of power from the +12 V rail.
• An alternate method of power delivery is to use a power supply has a 2 x 10 main power cable.
In this configuration, use three connectors to provide power to the board:
The main power connector
The ATX12V connector
The alternate power connector
The combination of the 2 x 10 main power cable and the alternate power cable can provide up
to 144 W of power from the +12 V rail (72 W each).
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