MSI FM2-A85XA-G43 - Manual (Page 45)

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MS-7793
Chapter 1
CLR_CMOS1: Clear CMOS Button
There s CMOS RAM onboard that s external powered from a battery located on the
manboard to save system configuraton data. Wth the CMOS RAM, the system can
automatcally boot nto the operatng system (OS) every tme t s turned on. If you want
to clear the system configuraton, press the button to clear the data.
Important
Make sure that you power off the system before clearng the CMOS data.