MSI G41M-P25 - Manual (Page 20)

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overclock FSB Switch: oC_SW (optional)
you can overclock the FSB to increase the processor frequency by changing the
switch. Follow the instructions below to set the FSB.
default 200➔266 mHz 200➔ mHz 266➔ mHz
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.
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