MSI H61I-E35 (B3) - Manual (Page 17)

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MS-7677
Clear CMoS Jumper: JBat
there is a CMoS RaM onboard that has a power supply from an external battery
to keep the data of system configuration. With the CMoS RaM, the system can
automatically boot oS every time it is turned on. if you want to clear the system
configuration, set the jumper to clear data.
JBat
keep data Clear data
1
1
iMPoRtant
you can clear CMoS by shorting -2 pin while the system is off, then open it. avoid
clearing the CMoS while the system is on; it will damage the mainboard.
PCi express Slot
the PCi express slot supports the PCi express interface expansion card.
PCi express x slot.