Gigabyte GA-H55-UD3H (REV. 1.0) [23/96] 4 5 cpu_fan sys_fan1 sys_fan2 pwr_fan fan headers

- 23 - Hardware Installation

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 4-pin (SYS_FAN2) and two 3-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 recom-

mended that a system fan be installed inside the chassis.

• Be sure to connect fan cables to the fan headers to prevent your CPU and system from over-

heating. Overheating may result in damage to the CPU or the system may hang.

• These fan headersare not conguration jumper blocks. Do not place ajumper cap on the

headers.

CPU_FAN:

PinNo. Denition

1 GND

2 +12V / Speed Control

3 Sense

4 Speed Control

SYS_FAN2:

PinNo. Denition

1 GND

2 +12V / Speed Control

3 Sense

4 Reserve

SYS_FAN1/PWR_FAN:

PinNo. Denition

1 GND

2 +12V

3 Sense

SYS_FAN1/PWR_FAN

CPU_FAN

G.QBOFM

SYS_FAN2

G.QBOFM

6) FDD (Floppy Disk Drive Connector)

 Thisconnector is usedtoconnecta oppydiskdrive.Thetypesofoppy disk drivessupportedare:

360KB,720KB,1.2MB,1.44MB,and2.88MB.Beforeconnectingaoppydiskdrive,besuretolocate

pin1oftheconnectorandtheoppydiskdrivecable.Thepin1ofthecableistypicallydesignatedbya

stripeofdifferentcolor.Forpurchasingtheoptionaloppydiskdrivecable,pleasecontactthelocaldealer.