Gigabyte GA-MA770-UD3 Manual - Page 23

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 recommended that a system fan be installed inside the chassis. 1 CPU_FAN CPU_FAN: Pin No. 1 2 3 4 Definition GND +12V / Speed Control Sense Speed Control 1 SYS_FAN1 SYS_FAN1: Pin No. 1 2 3 4 Definition GND Speed Control Sense +5V 1 SYS_FAN2/PWR_FAN SYS_FAN2/PWR_FAN: Pin No. Definition 1 GND 2 +12V 3 Sense 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. Pin No. Definition 1 GND 1 2 +12V 3 NC • 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. - 23 - Hardware Installation