MSI 745 ULTRA User Guide - Page 69

Frequency/Voltage Control

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Chapter 3 Frequency/Voltage Control This section describes how to set the Chassis Intrusion feature, CPU FSB frequency, monitor the current hardwae status including CPU/system temperatures, CPU/System Fan speeds, Vcore etc. Monitor function is available only if there is hardware monitoring mechanism onboard. Spread Spectrum When the motherboard 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, setting to Enabled for EMI reduction. Remember to disable Spread Spectrum if you are overclocking be cause even a slight jitter can introduce a temporary boost in clockspeed which may just cause your overclocked processor to lock up. Unused PCI Slot/DIMM Clock This setting enables you to stop or activate the unused PCI slot & DIMM clock. Setting options: Stop, Action. 3-26

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Chapter 3
3-26
Frequency/Voltage Control
This section describes how to set the Chassis Intrusion feature, CPU FSB
frequency, monitor the current hardwae status including CPU/system
temperatures, CPU/System Fan speeds, Vcore etc.
Monitor function is available
only if there is hardware monitoring mechanism onboard.
Spread Spectrum
When the motherboard 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, setting to
Enabled
for EMI
reduction. Remember to disable Spread Spectrum if you are overclocking be
cause even a slight jitter can introduce a temporary boost in clockspeed which
may just cause your overclocked processor to lock up.
Unused PCI Slot/DIMM Clock
This setting enables you to stop or activate the unused PCI slot & DIMM
clock.
Setting options:
Stop, Action
.