MSI P4M900M3-L Manual page 17

This field allows you to select the memory timing setting. Setting to [Auto] enables Max
Memclock (Mhz) automatically to be determined by SPD. Selecting [Manual] allows users to
configure these fields manually.
Advance DRAM Configuration > 1T CMD Support
This field allows you to enable/disable the memory 1T CMD rate support.
Adjust PCI/PCI Express Frequency
This field allows you to select the PCI/PCIE frequency (in MHz).
Auto Disable DIMM/PCI Clock
When set to [Enabled], the system will remove (turn off) clocks from empty DIMM and PCI
slots to minimize the electromagnetic interference (EMI).
Adjust DDR/NB Voltage
These items allow you to adjust the Memory/North Bridge 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.
Spread Spectrum
When the motherboard's clock generator pulses, the extreme values (spikes) of the pulses
create 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.
Important:
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.
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.
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.
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