Gigabyte GA-MF3 User Manual page 27

17) CLR_CMOS (Clear CMOS)
You may clear the CMOS data to its default values by this header. To clear CMOS, temporarily
short the two pins. Default doesn't include the jumper to avoid improper use of this header.
18) 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.
Open: Normal
Short: Clear CMOS
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Pin No. Definition
1 Signal
2 GND
Hardware Installation