Intel BLKD925XBCLK Product Specification - Page 74
Power Supply Connectors, INTEGRATOR'S NOTE
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Intel Desktop Boards 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. # 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). 74