MSI P31 User Guide - Page 23

Power Supply

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Hardware Setup Power Supply ATX 24-Pin Power Connector: ATX1 This connector allows you to connect an ATX 24-pin power supply. To connect the ATX 24-pin power supply, make sure the plug of the power supply is inserted in the proper orientation and the pins are aligned. Then push down the power supply firmly into the connector. You may use the 20-pin ATX power supply as you like. If you'd like to use the 20-pin ATX power supply, please plug your power supply along with pin 1 & pin 13 (refer to the image at the right hand). There is also a foolproof design on pin 11, 12, 23 & 24 to avoid wrong installation. 12 24 ATX1 1 13 Pin Definition PIN SIGNAL 1 +3.3V 2 +3.3V 3 GND 4 +5V 5 GND 6 +5V 7 GND 8 PW R OK 9 5VSB 10 +12V 11 +12V 12 +3.3V PIN SIGNAL 13 +3.3V 14 -12V 15 GND 16 PS-ON# 17 GND 18 GND 19 GND 20 Res 21 +5V 22 +5V 23 +5V 24 GND pin 13 pin 12 ATX 12V Power Connector: JPW1 This 12V power connector JPW 1 is used to provide power to the CPU. 4 2 3 1 JPW1 Pin Definition PIN SIGNAL 1 GND 2 GND 3 12V 4 12V Important 1. Maker sure that all the connectors are connected to proper ATX power supplies to ensure stable operation of the mainboard. 2. Power supply of 350 watts (and above) is highly recommended for system stability. 2-9

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2-9
Hardware Setup
Power Supply
PIN
SIGNAL
13
+3.3V
14
-12V
15
GND
16
PS-ON#
17
GND
18
GND
19
GND
20
Res
21
+5V
22
+5V
23
+5V
24
GND
PIN
SIGNAL
1
+3.3V
2
+3.3V
3
GND
4
+5V
5
GND
6
+5V
7
GND
8
PW R OK
9
5VSB
10
+12V
11
+12V
12
+3.3V
Pin Definition
pin 12
pin 13
Important
1. Maker sure that all the connectors are connected to proper ATX power sup-
plies to ensure stable operation of the mainboard.
2. Power supply of 350 watts (and above) is highly recommended for system
stability.
ATX 24-Pin Power Connector: ATX1
This connector allows you to connect an ATX 24-pin power supply.
To connect the ATX 24-pin power supply, make sure the plug of the
power supply is inserted in the proper orientation and the pins are
aligned. Then push down the power supply firmly into the connector.
You may use the 20-pin ATX power supply as you like. If you
’
d like
to use the 20-pin ATX power supply, please plug your power sup-
ply along with pin 1 & pin 13 (refer to the image at the right hand).
There is also a foolproof design on pin 11, 12, 23 & 24 to avoid
wrong installation.
PIN
SIGNAL
1
GND
2
GND
3
12V
4
12V
Pin Definition
ATX 12V Power Connector: JPW1
This 12V power connector JPW1 is used to provide power to the CPU.
1
ATX1
12
24
13
JPW1
1
3
4
2