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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 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.
•
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.
•
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 processor core power 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 processor core connector
⎯ The alternate power connector
Table 27.
Main Power Connector
Pin
Signal Name
1
+3.3 V
2
+3.3 V
3
Ground
4
+5 V
5
Ground
6
+5 V
7
Ground
8
PWRGD (Power Good)
9
+5 V (Standby)
10
+12 V
11
+12 V
12
2 x 12 connector detect
Note: When using a 2 x 10 power supply cable, this pin will be unconnected.
(Note)
(Note)
Pin
Signal Name
13
+3.3 V
14
-12 V
15
Ground
16
PS-ON# (power supply remote on/off)
17
Ground
18
Ground
19
Ground
20
No connect
21
+5 V
22
+5 V
(Note)
23
+5 V
(Note)
24
Ground
Technical Reference
67
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