Gigabyte GA-785GMT-USB3, User Manual, Page: 25 / 112

- 25 - Hardware Installation
3/4) CPU_FAN/SYS_FAN (Fan Headers)
The motherboard has a 4-pin CPU fan header (CPU_FAN)and a 4-pin system fan header(SYS_FAN).
Each fan header supplies a +12V power voltage and possesses a foolproof insertion design. When con-
necting 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 dissipa-
tion, it is recommended that a system fan be installed inside the chassis.
CPU_FAN:
Pin No. Definition
1
GND
2 +12V / Speed Control
3 Sense
4 Speed Control
SYS_FAN:
Pin No. Definition
1
GND
2 +12V / Speed Control
3 Sense
4 Reserve
• 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.
CPU_FAN
SYS_FAN
G.QBOFM
G.QBOFM
1
1
5) 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. For purchasing the optional floppy disk drive cable, please contact the local dealer.
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