Lenovo System x3550 M4 - Page 229

x4=x4organization(4DQlinesperSDRAM)
x8=x8organization
x16=x16organization
–vistheSDRAMandsupportcomponentsupplyvoltage(VDD)
•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,theserverautomaticallyoperateswithamaximummemory
speedofupto1600MHzwhenthefollowingconditionismet:
Chapter6.Removingandreplacingcomponents215