MSI P55M-GD45 User Guide - Page 65

V/ddr_vref_ca_b V/ Ddr_vref_da_a V/ddr_vref_da_b V/ Pch - problem

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Page 65 highlights

MS-7588 ▶ Channel 1/ Channel2 Advanced Memory Setting Setting to [Auto] enables the advance memory timing automatically to be determined by BIOS. Setting to [Manual] allows you to set the following advanced memory timings. ▶ Memory Ratio This item allows you to set the memory multiplier. ▶ Adjusted DRAM Frequency (MHz) It shows the adjusted DRAM frequency. Read-only. ▶ QPI Ratio This item allows you to set the QPI multiplier. ▶ Adjusted QPI Frequency (MHz) It shows the adjusted QPI frequency. Read-only. ▶ ClockGen Tuner Press to enter the sub-menu and the following screen appears. ▶ CPU Amplitude Control/ PCI Express Amplitude Control These items are used to select the CPU/ PCI Express clock amplitude. ▶ Adjust PCI-E Frequency (MHz) This field allows you to select the PCIE frequency (in MHz). ▶ Auto Disable PCI Frequency When set to [Enabled], the system will remove (turn off) clocks from empty PCI slot to minimize the electromagnetic interference (EMI). ▶ CPU Voltage(V)/ CPU VTT (V)/ PCH 1.8V (V)/ DRAM Voltage (V)/ DDR_VREF_CA_A (V)/ / DDR_VREF_CA_B (V)/ DDR_VREF_DA_A (V)/ / DDR_VREF_DA_B (V)/ PCH 1.05V (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. 3-23

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3-23
MS-7588
Channel 1/ Channel2 Advanced Memory Sett±ng
Sett±ng to [Auto] enables the advance memory t±m±ng automat±cally to be determ±ned
by BIOS. Sett±ng to [Manual] allows you to set the follow±ng advanced memory t±m-
±ngs.
Memory Rat±o
Th±s ±tem allows you to set the memory mult±pl±er.
Adjusted DRAM Frequency (MHz)
It shows the adjusted DRAM frequency. Read-only.
QPI Rat±o
Th±s ±tem allows you to set the QPI mult±pl±er.
Adjusted QPI Frequency (MHz)
It shows the adjusted QPI frequency. Read-only.
ClockGen Tuner
Press <Enter> to enter the sub-menu and the follow±ng screen appears.
CPU Ampl±tude Control/ PCI Express Ampl±tude Control
These ±tems are used to select the CPU/ PCI Express clock ampl±tude.
Adjust PCI-E Frequency (MHz)
Th±s field allows you to select the PCIE frequency (±n MHz).
Auto D±sable PCI Frequency
When set to [Enabled], the system w±ll remove (turn off) clocks from empty PCI slot to
m±n±m±ze the electromagnet±c ±nterference (EMI).
CPU Voltage(V)/ CPU VTT (V)/ PCH 1.8V (V)/ DRAM Voltage (V)/ DDR_VREF_CA_A
(V)/ / DDR_VREF_CA_B (V)/ DDR_VREF_DA_A (V)/ / DDR_VREF_DA_B (V)/ PCH
1.05V (V)
These ±tems are used to adjust the voltage of CPU, Memory and ch±pset.
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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