Intel DB75EN Technical Product Specification - Page 51
Power Supply Connectors
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Technical Reference 2.2.2.3 Power Supply Connectors The board has the following 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 to the main power connector, leaving pins 11, 12, 23, and 24 unconnected. • Processor core 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. Table 24. Processor Core Power Connector Pin Signal Name Pin Signal Name 1 Ground 2 Ground 3 +12 V 4 +12 V Table 25. Main Power Connector Pin 1 2 3 4 5 6 7 8 9 10 11 12 Signal Name +3.3 V +3.3 V Ground +5 V Ground +5 V Ground PWRGD (Power Good) +5 V (Standby) +12 V +12 V (Note) 2 x 12 connector detect (Note) Pin 13 14 15 16 17 18 19 20 21 22 23 24 Signal Name +3.3 V -12 V Ground PS-ON# (power supply remote on/off) Ground Ground Ground No connect +5 V +5 V +5 V (Note) Ground (Note) Note: When using a 2 x 10 power supply cable, this pin will be unconnected. For information about Power supply considerations Refer to Section 2.6.1 on page 58 51