Gigabyte GA-945PL-S3 Manual - Page 20
CPU_FAN / SYS_FAN / PWR_FAN Cooler Fan Power Connector, NB_FAN Chip Fan Connector - motherboards
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English 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). Remember to connect the CPU/system fan cable to the CPU_FAN/SYS_FAN connector to prevent CPU damage or system hanging caused by overheating. 1 CPU_FAN 1 SYS_FAN 1 PWR_FAN CPU_FAN: Pin No. 1 2 3 4 Definition GND +12V/Speed Control Sense Speed Control SYS_FAN/PWR_FAN: Pin No. 1 2 3 Definition GND +12V Sense 6) NB_FAN (Chip Fan 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. Definition 1 1 GND 2 +12V 3 NC GA-945PL-(D)S3 Motherboard - 20 -