MSI G31TM-P21 User Guide - Page 25

thE grEATEr ThE SprEAD SpEcTrUm vAlUE Is, ThE grEATEr ThE eMi Is rEDUcED, - overclocking

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Page 25 highlights

MS-7529 DIMM1~2 Memory SPD Information Press to enter the sub-menu. The sub-menu displays the information of installed memory. Advance DRAM Configuration > DRAM CAS# Latency The field controls the CAS latency, which determines the timing delay before DRAM starts a read command after receiving it. [2T] increases system performance while [2.5T] provides more stable system performance. Setting to [By SPD] enables DRAM CAS# Latency automatically to be determined by BIOS based on the configurations on the SPD (Serial Presence Detect) EEPROM on the DRAM module. FSB/DRAM Ratio This item will allow you to adjust the ratio of FSB to memory. Adjusted DRAM Frequency (MHz) It shows the adjusted memory frequency. Read-only. Adjust PCI-E Frequency (MHz) This item allows you to adjust the PCI-E frequency. 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). Spread Spectrum When the motherboard'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. 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 overclocked processor to lock up. 25

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25
MS-7529
diMM±~2 MEmOrY SPd iNfOrmATION
PrEss <eNTEr> TO ENTEr ThE sUb-mENU. thE sUb-mENU DIsplAYs ThE INfOrmATION
Of INsTAllED mEmOrY.
aDvANcE dRaM CONfigUrATION > dRaM CaS# LATENcY
thE fiElD cONTrOls ThE CaS lATENcY, whIch DETErmINEs ThE TImINg DElAY bEfOrE
dRaM sTArTs A rEAD cOmmAND AfTEr rEcEIvINg IT. [2t] INcrEAsEs sYsTEm pErfOr-
mANcE whIlE [2.5t] prOvIDEs mOrE sTAblE sYsTEm pErfOrmANcE. SETTINg TO [BY SPd]
ENAblEs dRaM CaS# LATENcY AUTOmATIcAllY TO bE DETErmINED bY BioS bAsED ON
ThE cONfigUrATIONs ON ThE SPd (SErIAl PrEsENcE dETEcT) eePRoM ON ThE dRaM
mODUlE.
FSB/dRaM RATIO
thIs ITEm wIll AllOw YOU TO ADjUsT ThE rATIO Of FSB TO mEmOrY.
aDjUsTED dRaM FrEQUENcY (MHz)
iT shOws ThE ADjUsTED mEmOrY frEQUENcY. READ-ONlY.
aDjUsT PCi-e FrEQUENcY (MHz)
thIs ITEm AllOws YOU TO ADjUsT ThE PCi-e frEQUENcY.
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).
SprEAD SpEcTrUm
WhEN ThE mOThErbOArD’s clOck gENErATOr pUlsEs, ThE ExTrEmE vAlUEs (spIkEs) Of
ThE pUlsEs crEATE eMi (elEcTrOmAgNETIc iNTErfErENcE). thE SprEAD SpEcTrUm fUNc-
TION 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 prOcEs-
sOr TO lOck Up.
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 OvErclOckED prOcEssOr TO lOck Up.
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