Frequency/Voltage Control - MSI 651M-V User Manual

BIOS Setup

Frequency/Voltage Control

Use this menu to specify your settings for frequency/voltage control.
Set CPU Ratio
User may select to set the CPU ratio manually or use the default value of the
motherboard manufacturer. Settings: [Manual], [Default]
CPU Clock Ratio
End users can overclock the processor (only if the processor supports so) by
specifying the CPU ratio (clock multiplier) in this field. It is available only when Set
CPU Ratio is set to [Manual].
Auto Detect DIMM/PCI Clk
This item is used to auto detect the PCI slots. When set to [Enabled], the system will
remove (turn off) clocks from empty PCI slots to minimize the electromagnetic inter-
ference (EMI). Settings: [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, 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.
CPU Frequency
Use this item to select the appropriate clock frequency of the CPU host bus. Options
are: [100MHz], [133MHz], [Default].
DRAM Frequency
Use this item to select the appropriate frequency for your DDR SDRAM modules.
Options are: [200MHz], [266MHz], [333MHz] and [By SPD].
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