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Chapter 3
Frequency/Voltage Control
CMOS Setup Utility - Copyright(C) 1984-2000 Award Software
Frequency/Voltage Control
8
Auto Detect DIMM/PCI Clk
This item is used to auto detect the DIMM and PCI slots to minimize the
electromagnetic interference (EMI). When set to Enabled, the system will
remove (turn off) clocks from empty DIMM or PCI slots. Settings: Disabled
and Enabled.
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
clockspeed of 25MHz (with a 1GHz CPU) which may just cause your
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