CPU fan connector
This
3-pin / 4-pin connector is
dedicated for providing the
power source and displaying
the CPU fan speed.
CPU fan 3-pin IDC male connector at
the motherboard
|
Pin
|
Name
|
|
1
|
GND
|
|
2
|
+12V
|
|
3
|
Sense tachometer
|
CAUTION:
Do not place a jumper on this
connector; serious board damage
will result if the 12v is
shorted to ground.
Chassis
and CPU fans may use either
3-pin or 4-pin power connectors. 3-pin connectors are usually used for the smaller
chassis fans with lower power
consumption. 4-pin connectors are usually used by CPU fans
with higher power consumption
Fan has a 3-pin power connector; desktop board
has a 4-pin fan header:
Note:
when using a 3-pin power connector
with a 4-pin fan header, the
fan will always be on; there
is no fan control.
Fan has a 4-pin power connector; desktop board
has a 3-pin fan header:
