MSI 880GMA-E55 Serie Manuel D'instructions page 20

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Clear CMoS Jumper: JBat
there is a CMoS RaM on board with an external battery power supply to preserve
the system configuration data. With the CMoS RaM, the system can automatically
boot oS every time it is turned on. if you want to clear the system configuration,
use the button to clear data. Press the button to clear the data.
JBat
iMPoRtant
you can clear CMoS by shorting 2-3 pin while the system is off. then return to
-2 pin position. avoid clearing the CMoS while the system is on; it will damage
the mainboard.
overclock FSB Switch: oC_SW
you can overclock the FSB to increase the processor frequency by changing the
switch. Follow the instructions below to set the FSB.
default
iMPoRtant
Make sure that you power off the system before setting the switch.
*
When overclocking cause system instability or crash during boot, please set the
*
switch to default setting.
aPS Led Status indicator: Led
the aPS (active Phase Switching) Led indicates the current CPu power phase
mode. Follow the instructions below to read.
on
oFF
20
1
increase 0%
speed of CPu
clock
the Led will light when CPu is in 3 phase power mode.
the Led will go off when CPu is in  phase power mode.
1
Keep data
increase 5%
speed of CPu
clock
Led
1
Clear data
increase 20%
speed of CPu
clock