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3/4) CPU_FAN/SYS_FAN1/SYS_FAN2/SYS_FAN3/SYS_FAN4 (Fan Headers)
The motherboard has a 4-pin CPU fan header (CPU_FAN), two 4-pin (SYS_FAN1/SYS_FAN2) and two
3-pin (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 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.
SYS_FAN3/SYS_FAN4:
Pin No. De��nition
1
GND
2
+12V
3
Sense
• Be sure to connect fan cables to the fan headers to prevent your CPU and system from overheating. Overheat-
ing 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.
5) CLR_CMOS (Clear CMOS Jumper)
Use this jumper to clear the CMOS values (e.g. date information and BIOS con��gurations) 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 the CMOS values.
• After system restart, go to BIOS Setup to load factory defaults (select Load Optimized Defaults) or manually
con��gure the BIOS settings (refer to Chapter 2, "BIOS Setup," for BIOS con��gurations).
Hardware Installation
CPU_FAN:
Pin No. De��nition
1
CPU_FAN
1
SYS_FAN1:
Pin No. De��nition
SYS_FAN1
SYS_FAN2:
Pin No. De��nition
1
SYS_FAN2
1
SYS_FAN3/SYS_FAN4
Open: Normal
Short: Clear CMOS Values
- 24 -
1
GND
2
+12V /Speed Control
3
Sense
4
Speed Control
1
GND
2
+12V /Speed Control
3
Sense
4
Reserve
1
GND
2
+12V
3
Sense
4
Speed Control
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