GIGABYTE AMD Socket AM2 Motherboard GA-3PXSL-RH - Manual (Page 23)

Jumper Setting
2 3
T ) CLR_CMOS (Clear CMOS Function)
You may clear the CMOS data to its default values by this jumper.
Default value doesn’t include the “Shunter” to prevent from improper use this jumper. To
clear CMOS, temporarily short 1-2 pin.
1
1
1-2 close: Clear CMOS
2-3 close: Normal (Default value)