Gigabyte GA-970A-DS3 User Manual page 15

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 speed control function requires the use of a fan with fan speed
control design. For optimum heat dissipation, it is recommended 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 overheating. Overheating
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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.
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6) CLR_CMOS (Clear CMOS Jumper)
Use this jumper to clear the CMOS values (e.g. date information and BIOS configurations) and reset the
CMOS values to factory defaults. To clear the CMOS values, use a metal object like a screwdriver to touch
the two pins for a few seconds.
Always turn off your computer and unplug the power cord from the power outlet before clearing
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the CMOS values.
After system restart, go to BIOS Setup to load factory defaults (select Load Optimized
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Defaults) or manually configure the BIOS settings (refer to Chapter 2, "BIOS Setup," for BIOS
configurations).
CPU_FAN:
Pin No. Definition
1
CPU_FAN
SYS_FAN1:
Pin No. Definition
1
SYS_FAN1
SYS_FAN2/PWR_FAN:
Pin No. Definition
1
1
SYS_FAN2 PWR_FAN
Open: Normal
Short: Clear CMOS Values
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1 GND
2 +12V
3 Sense
4 Speed Control
1 GND
2 +12V
3 Sense
4 Reserve
1 GND
2 +12V
3 Sense