MSI 945GM3-F User Guide - Page 58

BIOS Setup Adjust PCI Express Frequency This item allows you to select the PCI Express clock frequency (in MHz) and overclock the processor by adjusting the PCI Express clock to a higher frequency. Adjust PCI Frequency This item allows you to select the PCI clock frequency (in MHz) and overclock the processor by adjusting the PCI clock to a higher frequency. Adjust NB Voltage (V) These item adjusts the voltage of North Bridge Voltage. Any changes made to this setting may cause a stability issue, so changing the NB voltage for long-term purpose is NOT recommended. Auto Disable PCI Clock 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 interference (EMI). 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. Important 1. 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, select the value of Spread Spectrum for EMI reduction. 2. The greater the Spread Spectrum value is, the greater the EMI is reduced, and the system will become less stable. For the most suitable Spread Spectrum value, please consult your local EMI regulation. 3. 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. 3-21