MSI 990FXA User Guide - Page 51

MS-7640, Current CPU / DRAM Frequency, CPU Base Frequency, Adjust PCI-E Frequency MHz, Spread

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Overclocking MS-7640 Chapter 3 ▶ Current CPU / DRAM Frequency These items show the current clocks of CPU and Memory speed. Read-only. ▶ CPU Base Frequency This item is used to adjust the CPU base frequency (in MHz). ▶ Adjust PCI-E Frequency (MHz) This field allows you to select the PCI-E frequency (in MHz). ▶ OC Genie Button Operation This field is used to enable/ disable OC Genie function. ▶ Spread Spectrum When the mainboard'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. 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. 3-11

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3-11
MS-7640
Chapter 3
Overclock±ng
Current CPU / DRAM Frequency
These ±tems show the current clocks of CPU and Memory speed. Read-only.
CPU Base Frequency
Th±s ±tem ±s used to adjust the CPU base frequency (±n MHz).
Adjust PCI-E Frequency (MHz)
Th±s field allows you to select the PCI-E frequency (±n MHz).
OC Gen±e Button Operat±on
Th±s field ±s used to enable/ d±sable OC Gen±e funct±on.
Spread Spectrum
When the ma±nboard’s clock generator pulses, the extreme values (sp±kes) of the pulses
create EMI (Electromagnet±c Interference). The Spread Spectrum funct±on reduces the
EMI generated by modulat±ng the pulses so that the sp±kes of the pulses are reduced
to flatter curves.
Important
If you do not have any EMI problem, leave the sett±ng at [D±sabled] for opt±mal system
stab±l±ty and performance. But ±f you are plagued by EMI, select the value of Spread
Spectrum for EMI reduct±on.
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