Smart Switch - ASROCK X299 Extreme4 Manual

2.7 Smart Switch

The motherboard has a smart switch: Clear CMOS Button, allowing users to clear
the CMOS values.
Clear CMOS Button
(CLRCBTN)
(see p.3, No. 14)
This function is workable only when you power off your computer and unplug the
power supply.
X299 Extreme4
Clear CMOS Button
allows users to quickly
clear the CMOS values.
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