Lenovo System x3250 M4 - Unbuffered Dimms (Udimms)

–aaistheCASlatency,inclocksatmaximumoperatingfrequency
–bbistheJEDECSPDRevisionEncodingandAdditionslevel
–ccisthereferencedesignfileforthedesignoftheDIMM
Notes:
1.TodeterminethetypeofaDIMM,seethelabelontheDIMM.Theinformationonthelabelisinthe
formatxGBnRxxPC3v-xxxxxx-xx-xx-xx.Thenumeralinthesixthnumericalpositionindicates
whethertheDIMMissingle-rank(n=1)ordual-rank(n=2).
2.Theamountofusablememoryisreduced,dependingonthesystemconfiguration.Acertain
amountofmemorymustbereservedforsystemresources.Toviewthetotalamountofinstalled
memoryandtheamountofconfiguredmemory,runtheSetuputility.Foradditionalinformation,see
“Configuringtheserver”onpage62
.
UnbufferedDIMMs(UDIMMs)
ThefollowingnotesprovideinformationthatyoumustconsiderwhenyouinstallUDIMMs.
•ThememorychannelsrunatthelowestcommonfrequencyoftheDIMMsinstalled.
•TheUDIMMoptionsthatareavailablefortheserverare1GB,2GB,4GB,and8GB(whenavailable)
DIMMs.
•Theserversupportsuptotwosingle-rankordual-rankUDIMMsperchannel.
•ThefollowingtableliststhesupportedUDIMMpopulation.
Table7.SupportedUDIMMpopulationperchannel
DIMMconnectors
perchannel
DIMMsinstalledin
eachchannelDIMMtypeDIMMspeed
RanksperDIMM
(anycombination)
21
UnbufferedDDR3
ECC
1066,1333,1600
Single-rank,
dual-rank
22
UnbufferedDDR3
ECC
1066,1333,1600
Single-rank,
dual-rank
•ThefollowingtableliststhemaximumDIMMpopulationusingrankedUDIMMs.
Table8.MaximummemorypopulationusingrankedUDIMMs(dependingonyourmodel)
NumberofUDIMMsDIMMtypeSizeTotalmemory
4
Single-rankUDIMMs1GB4GB
4Dual-rankUDIMMs
2GB8GB
4Dual-rankUDIMMs
4GB16GB
4Dual-rankUDIMMs
8GB32GB
•ThefollowingtableshowstheUDIMMmemorypopulationruletooptimizethesystemperformance.
Table9.UDIMMpopulationrule
DIMMconnector1DIMMconnector2DIMMconnector3DIMMconnector4
PopulatedEmptyEmptyEmpty
PopulatedEmptyPopulatedEmpty
PopulatedPopulatedPopulatedPopulated
46LenovoSystemx3250M4InstallationandServiceGuide