Lenovo System x3250 M4 - Page 170

–eRisthenumberofranks
–1R=single-rank
–2R=dual-rank
–4R=quad-rank
–xfisthedeviceorganizationorbitwidth(forexample,x4,x8,orx16)
–x4=x4organization(4DQlinesperSDRAM)
–x8=x8organization
–x16=x16organization
–wwwwwistheDIMMbandwidth,inMBps
•8500=8.53GBps(DDR3-1066SDRAMs,8-byteprimarydatabus)
•10600=10.66GBps(DDR3-1333SDRAMs,8-byteprimarydatabus)
•12800=12.80GBps(DDR3-1600SDRAMs,8-byteprimarydatabus)
–mistheDIMMtype
•E=UnbufferedDIMM(UDIMM)withECC(x72-bitmoduledatabus)
•R=RegisteredDIMM(RDIMM)
•U=UnbufferedDIMMwithnoECC(x64-bitprimarydatabus)
–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.
Table31.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
156LenovoSystemx3250M4InstallationandServiceGuide