Gigabyte GA-8I955X Pro User Manual page 21

3/4/5) CPU_FAN / SYS_FAN/ PWR_FAN (Cooler Fan Power Connector)
The cooler fan power connector supplies a +12V power voltage via a 3-pin/4-pin (only for
CPU_FAN) power connector and possesses a foolproof connection design.
Most coolers are designed with color-coded power connector wires. A red power connector wire
indicates a positive connection and requires a +12V power voltage. The black connector wire is
the ground wire (GND).
Please remember to connect the power to the cooler to prevent system overheating and failure.
Caution!
Please remember to connect the power to the CPU fan to prevent CPU overheating and failure.
6) NB_FAN (Chip Fan Power Connector)
If you installed wrong direction, the chip fan will not work. Sometimes will damage the chip fan.
(Usually black cable is GND)
Pin No.
1
1
CPU_FAN
2
3
1
4
SYS_FAN
1
PWR_FAN
Pin No.
1
- 21 -
Definition
GND
+12V
Sense
Speed Control
(Only for CPU_FAN)
Definition
1 +12V
2 GND
Hardware Installation