MSI E7500 User Manual - Page 64

Frequency/Voltage Control - overclock settings

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Frequency/Voltage Control System BIOS Setup CPU Clock Ratio End users can overclock the processor by specifying the CPU ratio (clock multiplier) in this field. 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, 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 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 overclocked processor to lock up. 3-25

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System BIOS Setup
3-25
Frequency/Voltage Control
CPU Clock Ratio
End users can overclock the processor by specifying the CPU ratio (clock
multiplier) in this field.
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
,
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
Enabled
for EMI
reduction.
Remember to disable Spread Spectrum if you are overclocking be-
cause even a slight jitter can introduce a temporary boost in clockspeed which
may just cause your overclocked processor to lock up.