Acer Power SP, Service Manual

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34 Chapter 2
Frequency Control
The following table describes the parameters found in this menu. Settings in boldface are the default and
suggested settings.
Parameter Description Options
CPU Clock Ratio If the CPU Ratio is set to Manual, end users can
choose a suitable ratio to support the CPU. 8x to 50x
Auto Detect PCI Clk This option allows you to enable/disable the
feature of auto detecting the clock frequency of
the installed DIMM/PCI bus. 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
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 because even a slight jitter can
introduce a temporary boost in clockspeed which
may just cause your overlock ed processor to
lock up.