Lenovo System x3500 M4 - Page 75

•Blank=1.5Vspecified
•L=1.35Vspecified,1.5Voperable
Note:Valuesforthesevoltagesare‘specified’whichmeansthedevicecharacteristicssuchas
timingaresupportedatthisvoltage.Valuesare‘operable’whichmeansthatthedevicescan
beoperatedsafelyatthisvoltage.However,devicecharacteristicssuchastimingmaynot
beguaranteed.Alldevicesmustbe‘tolerant’ofthehighestDDR3nominalvoltageof1.5V,
meaningthattheymaynotoperateat1.5Vbutmaybepoweredatthatvoltagewithoutdamage
tothedevices.
•wwwwwistheDIMMbandwidth,inMBps
–6400=6.40GBps(DDR3-800SDRAMs,8-byteprimarydatabus)
–8500=8.53GBps(DDR3-1066SDRAMs,8-byteprimarydatabus)
–10600=10.66GBps(DDR3-1333SDRAMs,8-byteprimarydatabus)
–12800=12.80GBps(DDR3-1600SDRAMs,8-byteprimarydatabus)
–14900=14.93GBps(DDR3-1866SDRAMs,8-byteprimarydatabus)
•mistheDIMMtype
–E=UnbufferedDIMM(UDIMM)withECC(x72-bitmoduledatabus)
–L=LoadReductionDIMM(LRDIMM)
–R=RegisteredDIMM(RDIMM)
–U=UnbufferedDIMMwithnoECC(x64-bitprimarydatabus)
•aaistheCASlatency,inclocksatmaximumoperatingfrequency
•bbistheJEDECSPDRevisionEncodingandAdditionslevel
•ccisthereferencedesignfileforthedesignoftheDIMM
•distherevisionnumberofthereferencedesignoftheDIMM
Note:TodeterminethetypeofaDIMM,seethelabelontheDIMM.Theinformationonthelabelisin
theformatxxxxxnRxxxPC3v-xxxxxx-xx-xx-xxx.Thenumeralinthesixthnumericalpositionindicates
whethertheDIMMissingle-rank(n=1),dual-rank(n=2),orquad-rank(n=4).
•ThefollowingrulesapplytoDDR3RDIMMspeedasitrelatestothenumberofRDIMMsinachannel:
–Whenyouinstall1RDIMMperchannel,thememoryrunsat1866MHz
–Whenyouinstall2RDIMMsperchannel,thememoryrunsat1600MHz
–Whenyouinstall3RDIMMsperchannel,thememoryrunsat1066MHz
–Allchannelsinaserverrunatthefastestcommonfrequency
–Donotinstallregistered,unbuffered,andloadreductionDIMMsinthesameserver
•Themaximummemoryspeedisdeterminedbythecombinationofthemicroprocessor,DIMMspeed,
DIMMtype,OperatingModesinUEFIsettings,andthenumberofDIMMsinstalledineachchannel.
•Intwo-DIMM-per-channelconfiguration,aserverwithanIntelXeon™E5-2600seriesmicroprocessor
automaticallyoperateswithamaximummemoryspeedofupto1600MHzwhenthefollowingcondition
ismet:
–Two1.35Vsingle-rank,dual-rank,orquad-rankUDIMMs,RDIMMsorLRDIMMsareinstalledinthe
samechannel.IntheSetuputility,MemoryspeedissettoMaxperformanceandLV-DIMMpoweris
settoEnhanceperformancemode.The1.35VUDIMMs,RDIMMsorLRDIMMswillfunctionat1.5V.
•Theserversupportsamaximumof16dual-rankUDIMMs.TheserversupportsuptotwoUDIMMs
perchannel.
Chapter2.Installingoptionaldevices61