Frequency/Voltage Control - MSI 915 User Manual

Bios Setup

Frequency/Voltage Control

Use this menu to specify your settings for frequency/voltage control.
Current CPU Clock
The item shows the current status of CPU Frequency.
Adjust CPU Ratio
End users can overclock the processor (only if the processor supports so) by speci-
fying the CPU ratio (clock multiplier) in this field. It is available only when Set CPU
Ratio is set to [Manual]. Setting options: Min: [8], Max: [50].
Auto Detect PCI Clk
This item is used to auto detect the PCI slots. W hen set to [Enabled], the system will
remove (turn off) clocks from empty PCI slots to minimize the electromagnetic interfer-
ence (EMI). Setting options: [Enabled], [Disabled].
Spread Spectrum
W hen 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,
set 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 clock
speed which may just cause your overclocked processor to lock up. Setting options:
[Enabled], [Disabled].
M emory Voltage
Adjusting the DDR voltage can increase the DDR speed. Any changes made to this
setting may cause a stability issue, so changing the DDR voltage for long-term
purpose is NOT recommended. Setting options: [2.5V] to [3.3V].
PCI Express Voltage
Adjusting the voltage can increase the speed. Any changes made to this setting may
cause a stability issue, so changing the voltage for long-term purpose is NOT
recommended. Setting options: [1.5V] to [2.2V].
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