MSI X58A-GD65 - Manual (Page 63)

BIOS Setup MS-7522
Chapter 3
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BIOS Setup MS-7522
Chapter 3
CPU Amplitude Control/ PCI Express Amplitude Control
These items are used to select the CPU/ PCI Express clock amplitude.
CPU CLK Skew/ MCH CLK Skew
These items are used to select the CPU/ MCH chipset clock skew. They can help
CPU to reach the higher overclocking performance.
Adjust PCI Frequency (MHz)
This field allows you to select the PCI frequency (in MHz).
Adjust PCI-E Frequency (MHz)
This field allows you to select the PCIE frequency (in MHz).
Auto Disable PCI/PCI-E Frequency
When set to [Enabled], the system will remove (turn off) clocks from empty PCI and
PCI-E slots to minimize the electromagnetic interference (EMI).
CPU Voltage (V)/ CPU PLL Voltage (V)/ QPI Voltage (V)/ DRAM Voltage (V)/ DDR_
VREF_CA_A (V)/ DDR_VREF_CA_B (V)/ DDR_VREF_CA_C (V)/ DDR_VREF_DQ_A
(V)/ DDR_VREF_DQ_B (V)/ DDR_VREF_DQ_C (V)/ IOH Voltage (V)/ ICH Voltage (V)
These items are used to adjust the voltage of CPU, Memory and chipset.
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.
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 over-
clocked processor to lock up.
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