Gigabyte GA-6LASL Manual - Page 23
CPU Fan/System Fan Headers, PMBUS PMBus connector
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3/4/5/6/7) CPU0_FAN1/SYS_FAN1/SYS_FAN2/SYS_FAN3/SYS_FAN4 (CPU Fan/System Fan Headers) The motherboard has a 4-pin CPU fan header (CPU0_FAN1), and four 4-pin (SYS_FAN1/SYS_FAN2/ SYS_FAN3/SYS_FAN4) system fan headers. 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. SYS_FAN1 1 1 CPU0_FAN SYS_FAN3 Pin No. 1 2 3 4 Definition GND +12V Sense Speed Control SYS_FAN4 SYS_FAN2 • Be sure to connect fan cables to the fan headers to prevent your CPU and system from overheating. Overheating may result in damage to the CPU or the system may hang. • These fan headers are not configuration jumper blocks. Do not place a jumper cap on the headers. 8) PMBUS (PMBus connector) Pin No. Definition 1 SMB CLK 5 2 SMB DATA 3 SMB Alert 4 GND 1 5 3.3V Sense - 24 - Hardware Installation