MSI G52-MA00628 - Manual (Page 69)

BIOS Setup
3-27
Frequency/Voltage Control
This section describes how to set the CPU FSB frequency, spread spectrum,
clock ratio etc.
CPU Clock Ratio
End users can overclock the processor (only if the processor supports so)
by specifying the CPU ratio (clock multiplier) in this field.
Auto Detect DIMM/PCI Clk
This option allows you to enable/disable the feature of auto detecting the
clock frequency of the installed DIMM/PCI bus. The settings are: Enabled,
Disabled.
Spread Spectrum
When the motherboard’s clock generator pulses, the extreme values (spikes)
of the pulses creates EMI (Electromagnetic Interference). The Spread Spec-
trum function reduces the EMI generated by modulating the pulses so that the
spikes of the pulses are reduced to flatter curves. If you do not have any EMI
problem, leave the setting at Disabled for optimal system stability and
performance. But if you are plagued by EMI, setting to Enabled for EMI
reduction. Remember to disable Spread Spectrum if you are overclocking be-
cause even a slight jitter can introduce a temporary boost in clockspeed which
may just cause your overclocked processor to lock up.