Technical Reference
51
2.7.2.1 Power Supply Connectors
The board has 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.
#
INTEGRATOR’S NOTE
When using high wattage PCI Express x16 graphics cards, use a power supply with a 2 x 12 main
power cable. The 2 x 12 main power cable can provide up to 144 W of power from the +12 V rail.
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
No connect
9
+5 V (Standby)
21
+5 V
10 +12
V
22 +5
V
11
+12 V
(Note)
23
+5 V
(Note)
12
2 x 12 connector detect
(Note)
24
Ground
(Note)
Note: When using a 2 x 10 power supply cable, this pin will be unconnected.
Table 22. ATX12V Power Connector
Pin Signal
Name
Pin Signal
Name
1 Ground
2 Ground
3 +12
V
4 +12
V
