Acer AcerPower SV, Service Manual, Page: 45 / 113

38 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.