GIGABYTE GA-MA790GPT-UD3H - Manual (Page 26)

Hardware Installation - 26 -
3/4/5) CPU_FAN/SYS_FAN1/SYS_FAN2/PWR_FAN (Fan Headers)
The motherboard has a 4-pin CPU fan header (CPU_FAN), a 3-pin (SYS_FAN2) and a 4-pin (SYS_
FAN1) 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 control, which
requires the use of a CPU fan with fan speed control design. For optimum heat dissipation, it is recom-
mended that a system fan be installed inside the chassis.
CPU_FAN:
Pin No. Definition
1
GND
2 +12V / Speed Control
3 Sense
4 Speed Control
SYS_FAN1:
Pin No. Definition
1
GND
2 +12V / Speed Control
3 Sense
4 Reserve
SYS_FAN2/PWR_FAN:
Pin No. Definition
1
GND
2 +12V
3 Sense
• 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.
• These fan headers are not configuration jumper blocks. Do not place a jumper cap on the
headers.
1
CPU_FAN
SYS_FAN1
PWR_FAN SYS_FAN2
1
1
1
Pin No. Definition
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