Gigabyte GA-8S661GXMP User Manual page 23

13) CI (Chassis Intrusion, Case Open)
This 2-pin connector allows your system to detect if the chassis cover is removed. You can
check the "Case Open" status in BIOS Setup.
14) CLR_CMOS (Clear CMOS)
You may clear the CMOS data to its default values by this jumper. To clear CMOS, temporarily
short pins 1-2. To prevent improper use of this header, we do not include a jumper on it.
Pin No.
1
1
2
Open: Normal
1
Short: Clear CMOS
1
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Definition
Signal
GND
Hardware Installation