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- 27 - Hardware Installation
3/4/5) CPU_FAN/SYS_FAN1/SYS_FAN2/SYS_FAN3/PWR_FAN (Fan Headers)
The motherboard has a 4-pin CPU fan header (CPU_FAN), a 4-pin (SYS_FAN2) and two 3-pin (SYS_
FAN1/SYS_FAN3) system fan headers, and a 3-pin power fan header (PWR_FAN). Most fan headers
possess a foolproof insertion design. When connecting a fan cable, be sure to connect it in the correct
orientation (the black connector wire is the ground wire). The motherboard supports CPU fan speed con-
trol, which requires the use of a CPU fan with fan speed control design. For optimum heat dissipation, it
is recommended that a system fan be installed inside the chassis.
Be sure to connect fan cables to the fan headers to prevent your CPU, North Bridge and
system from overheating. Overheating may result in damage to the CPU/North Bridge or the
system may hang.
             
headers.
1
CPU_FAN:
 
1 GND
2 +12V / Speed Control
3 Sense
4 Speed Control
SYS_FAN2:
 
1 GND
2 +12V / Speed Control
3 Sense
4 Reserve
SYS_FAN1/SYS_FAN3/PWR_FAN:
 
1 GND
2 +12V
3 Sense
 
1 GND
2 +12V
3 NC
6) NB_FAN (North Bridge Fan Header)
Connect the North Bridge fan cable to this header. The fan header has a foolproof insertion design.
When connecting a fan cable, be sure to connect it in the correct orientation. Most fans are designed
with color-coded power connector wires. A red power connector wire indicates a positive connection and
requires a +12V voltage. The black connector wire is the ground wire.
1
CPU_FAN
SYS_FAN2
SYS_FAN1/PWR_FAN
G.QBOFM
G.QBOFM
1
1
SYS_FAN3
1
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