Technical Reference
47
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, pins 11, 12, 23, and 24 must
remain 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.
CAUTION
If a high power (75 W or greater) add-in card is installed in the PCI Express x16
connector, that card must also be connected directly to the power supply. Failure to do
so may cause damage to the board and the add-in card.
Table 20. Processor Core Power Connector
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12 V 4 +12 V
Table 21. Main Power Connector
Pin Signal Name Pin Signal Name
1 +3.3 V 13 +3.3 V
2 +3.3 V 14 −12 V
3 Ground 15 Ground
4 +5 V 16 PS-ON# (power supply remote on/off)
5 Ground 17 Ground
6 +5 V 18 Ground
7 Ground 19 Ground
8 PWRGD (Power Good) 20 −5 V (obsolete)
9 +5 V (Standby) 21 +5 V
10 +12 V 22 +5 V
11 +12 V
23 +5 V
12 +3.3 V 2 x 12 connector detect
(Note)
24 Ground
Note: When using a 2 x 10 power supply cable, this pin will be unconnected.
For information about Refer to
Power supply considerations Section 2.5.1 on page 54
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