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Chapter 3
Frequency/Voltage Control
Auto Detect DIMM/PCI Clk
This item is used to auto detect the DIMM/PCI slots. When set to Enabled,
the system will remove (turn off) clocks from empty DIMM/PCI slots to
minimize the electromagnetic interference (EMI). Settings: Enabled and
Disabled.
Spread Spectrum
When the motherboard 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 Disabled for optimal system
stability and performance. But if you are plagued by EMI, setting to En-
abled for EMI reduction. Remember to disable Spread Spectrum if you are
overclocking because even a 0.25% jitter can introduce a temporary boost in
clock speed of 25MHz (with a 1GHz CPU) which may just cause your
overclocked processor to lock up.
HOST CPU/PCI Clock
This item allows you to specify the combination of CPU FSB clock and PCI
clock. It provides end users an overclocking method. Settings: 66/33 MHz,
3-30
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