18
Chapter 2
HARDWARE INSTALLATION
User's Manual |
PR611-C621
X
Internal I/O Connectors
PWM Fan
4-pin Fan Pin Assignment
Pin Assignment
1
Ground
2
Power
3
Sense
4
Speed Control
Cooling Fan Connectors
X
Internal I/O Connectors
1
These fan connectors are used to connect cooling fans. The cooling fans will provide adequate
airflow throughout the chassis to prevent overheating the CPU and system board components.
The 4-pin fans provide PWM to modulate fan speed.
CPU Fan (PWM)
System Fan 1 (PWM)
System Fan 2 (PWM)
System Fan 3 (PWM)
Power Connector
Use a power supply that complies with the ATX12V Power Supply Design Guide Version 1.1. An
ATX12V power supply unit has a standard 24-pin ATX main power connector that must be in-
serted into the 24-pin connector. The 8-pin +12V power connector enables the delivery of more
+12VDC current to the processor’s Voltage Regulator Module (VRM).
The power connectors from the power supply unit are designed to fit the 24-pin and 8-pin con-
nectors in only one orientation. Make sure to find the proper orientation before plugging the
connectors.
The system board requires a minimum of 300 Watt power supply to operate. Your system con-
figuration (CPU power, amount of memory, add-in cards, peripherals, etc.) may exceed the mini-
mum power requirement. To ensure that adequate power is provided, we strongly recommend
that the system is supplied with a minimum of 400 Watt power.
ATX 24-pin Power
Connector
ATX 8-pin Power Connectors
+3.3V
+3.3V
GND
+5V
GND
+5V
GND
PWR_OK
+5VSB
+12V
+12V
+3.3V
+3.3V
-12V
GND
PS_ON#
GND
GND
GND
NC
+5V
+5V
+5V
GND
1
13
12
24
1
4
5
8
GND
+12V
1
4
5
8
GND
+12V
Important:
Insufficient power supplied to the system may result in instability or malfunction
of the add-in boards and peripherals. Calculating the system’s approximate power
usage is important to ensure that the power supply meets the system’s consump-
tion requirements.
