Gigabyte GA-G31-S3L Manual - Page 23

3/4/5/6) CPU_FAN/SYS_FAN1/SYS_FAN2/PWR_FAN (Fan Headers) The motherboard has a 4-pin CPU fan header (CPU_FAN), a 4-pin system fan header (SYS_FAN2), a 3-pin system fan header (SYS_FAN1), and a 3-pin power fan header (PWR_FAN). Each fan header supplies a +12V power voltage and possesses a foolproof insertion design. When connect- ing 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. 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. CPU_FAN: Pin No. Definition 1 CPU_FAN 1 GND 2 +12V/Speed Control 3 Sense 4 Speed Control SYS_FAN2: 1 Pin No. Definition 1 GND SYS_FAN2 2 +12V/Speed Control 3 Sense 4 +5V 1 SYS_FAN1 1 PWR_FAN SYS_FAN1 / 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 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. 7) FDD (Floppy Disk Drive Connector) This connector is used to connect a floppy disk drive. The types of floppy disk drives supported are: 360 KB, 720 KB, 1.2 MB, 1.44 MB, and 2.88 MB. Before connecting a floppy disk drive, be sure to locate pin 1 of the connector and the floppy disk drive cable. The pin 1 of the cable is typically designated by a stripe of different color. 33 1 34 2 - 23 - Hardware Installation