Frequency/Voltage Control - MSI MEGA 865 User Manual

Chapter 3

3.10 Frequency/Voltage Control

Auto Detect PCI Clk
This option allows you to enable/disable the feature of auto detecting the clock
frequency of the installed 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 Spectrum
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 [Disable] for optimal system stability and performance. But
if you are plagued by EMI, set to [Enabled] for EMI reduction. Remember to
disable Spread Spectrum if you are overclocking because even a slight jitter can
introduce a temporary boost in clock speed which may just cause your
overclocked processor to lock up.
CPU Clock
This item specifies the clock frequency of CPU host bus (FSB), AGP (3V66) and
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