Gigabyte GA-K8N51GMF User Manual page 24

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 Opened" 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
1-2 pin. Default doesn't include the "Shunter" to prevent from improper use this jumper.
GA-K8N51GMF Motherboard
Pin No.
1
1
2
1
Open: Normal
1
Short: Clear CMOS
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Definition
Signal
GND