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3) EXT_PWR (Note 1) (External Power Connector)
Connect one end of the EXT_PWR cable to this connector and the other end to your power supply.
EXT_PWR cable
Pin No.
Definition
1
VCC
2
GND
3
GND
4
+12V
1
EXT_PWR
EXT_PWR
4/5) CPU_FAN/SYS_FAN1/SYS_FAN2 (Note 1) (Fan Headers)
All fan headers on this motherboard are 4-pin. 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 speed control function requires the use of a fan with fan speed control design. For
optimum heat dissipation, it is recommended that a system fan be installed inside the chassis.
CPU_FAN
SYS_FAN1
1
CPU_FAN
Pin No.
Definition
1
GND
2
Voltage Speed Control
3
Sense
4
PWM Speed Control
1
SYS_FAN2
Fan power extension
cable
SYS_FAN1/
SYS_FAN2
(Note 1) The connector is on the front of GC-Z790I BTB PLUG.
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