MSI X58Pro-E User Guide - Page 65

Age V/ Ddr_vref_ca_a V/ Ddr_vref_ca_b V/ Ddr_vref_ca_c V/ Ddr - spec

Page 65 highlights

MS-7522 ▶ CPU Clock Drive/ PCI Express Clock Drive 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/ North Bridge chipset clock skew. They can help CPU to reach the higher overclocking performace. ▶ 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 DRAM/PCI Frequency When set to [Enabled], the system will remove (turn off) clocks from empty DIMM and PCI slots to minimize the electromagnetic interference (EMI). ▶ CPU Voltage (V)/ CPU Vcore/ CPU PLL Voltage (V)/ QPI Voltate (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)/ NB Voltage (V)/ ICH Voltage (V) These items are used to asjust the voltage of CPU, Memory, QPI and chipset. For CPU Voltage: The value here is the offset for you to adjust/add based on the current CPU voltage. Please read the real-time CPU voltage in "CPU Vcore" in the "H/W monitor" page. Please note the based CPU Voltage will vary depending on the different CPU you install. For QPI Voltage: The value here is the offset for you to adjust/add based on the current QPI voltage. The default based QPI Voltage is from 1.1V to 1.22V, and it will vary depending on the different CPU you install. You can read the QPI voltage in GreenPower Center. For DRAM Voltage: According to the Inte CPU spec, DRAM Voltage setting 1.65V may damage the CPU permanently. It is strongly recommended that you install the DRAM with the voltage setting below 1.65V. You can read the DRAM voltage in GreenPower Center. ▶ 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. 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. 3-23

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3-23
MS-7522
CPU Clock Dr±ve/ PCI Express Clock Dr±ve
These ±tems are used to select the CPU/ PCI Express clock ampl±tude.
CPU CLK Skew/ MCH CLK Skew
These ±tems are used to select the CPU/ North Br±dge ch±pset clock skew. They can
help CPU to reach the h±gher overclock±ng performace.
Adjust PCI Frequency (MHz)
Th±s field allows you to select the PCI frequency (±n MHz).
Adjust PCI-E Frequency (MHz)
Th±s field allows you to select the PCIE frequency (±n MHz).
Auto D±sable DRAM/PCI Frequency
When set to [Enabled], the system w±ll remove (turn off) clocks from empty DIMM and
PCI slots to m±n±m±ze the electromagnet±c ±nterference (EMI).
CPU Voltage (V)/ CPU Vcore/ CPU PLL Voltage (V)/ QPI Voltate (V))/ DRAM Volt-
age (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)/ NB Voltage (V)/ ICH
Voltage (V)
These ±tems are used to asjust the voltage of CPU, Memory, QPI and ch±pset.
For CPU Voltage:
The value here ±s the offset for you to adjust/add based on the current CPU voltage.
Please read the real-t±me CPU voltage ±n “CPU Vcore” ±n the “H/W mon±tor” page. Please
note the based CPU Voltage w±ll vary depend±ng on the d±fferent CPU you ±nstall.
For QPI Voltage:
The value here ±s the offset for you to adjust/add based on the current QPI voltage. The
default based QPI Voltage ±s from 1.1V to 1.22V, and ±t w±ll vary depend±ng on the d±ffer-
ent CPU you ±nstall. You can read the QPI voltage ±n GreenPower Center.
For DRAM Voltage:
Accord±ng to the Inte CPU spec, DRAM Voltage sett±ng 1.65V may damage the CPU
permanently. It ±s strongly recommended that you ±nstall the DRAM w±th the voltage set-
t±ng below 1.65V. You can read the DRAM voltage ±n GreenPower Center.
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. 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, set to Enabled for
EMI reduct±on. Remember to d±sable Spread Spectrum ±f you are overclock±ng because
even a sl±ght j±tter can ±ntroduce a temporary boost ±n clock speed wh±ch may just cause
your overclocked processor to lock up.