Lenovo x3650 M4 BD 5466 - Page 70

•WhenyouinstallorremoveDIMMs,theserverconfigurationinformationchanges.Whenyourestartthe
server,thesystemdisplaysamessagethatindicatesthatthememoryconfigurationhaschanged.
•Theserversupportsonlyindustry-standarddouble-data-rate3(DDR3)-1600or1866MHz(depending
ontheconfiguration),synchronousdynamicrandom-accessmemory(SDRAM)registereddualinline
memorymodules(DIMMs)witherrorcorrectingcode(ECC).
•ThespecificationsofaDDR3DIMMareonalabelontheDIMM,inthefollowingformat.
gggeRxff-PC3-wwwwwm-aa-bb-cc-dd
where:
–gggisthetotalcapacityoftheDIMM(forexample,1GB,2GB,or4GB)
–eisthenumberofranks
1=single-rank
2=dual-rank
–xffisthedeviceorganizationorbitwidth(forexample,x4,x8,orx16)
4=x4organization(4DQlinesperSDRAM)
8=x8organization
16=x16organization
–wwwwwistheDIMMbandwidth,inMBps
12800=12.80GBpsPC3-1600SDRAMs,8-byteprimarydatabus)
14900=14.93GBpsPC3-1866SDRAMS,8-byteprimarydatabus)
–mistheDIMMtype
E=UnbufferedDIMM(UDIMM)withECC(x72-bitmoduledatabus)
R=RegisteredDIMM(RDIMM)
U=UnbufferedDIMMwithnoECC(x64-bitprimarydatabus)
L=LoadReductionDIMM(LR-DIMM)
–aaistheDDR3SDRAMCASlatency,inclocksatmaximumoperatingfrequency
–bbistheJEDECSPDRevisionEncodingandAdditionslevel
–ccisthereferencedesignfileforthedesignoftheDIMM
–distherevisionnumberofthereferencedesignoftheDIMM
Note:TodeterminethetypeofaDIMM,seethelabelontheDIMM.Theinformationonthelabelisinthe
formatxxxnRxxxPC3-xxxxx-xx-xx-xx-xx.Thenumeralinthefourthnumericalpositionindicateswhether
theDIMMissingle-rank(n=1)ordual-rank(n=2).
•DonotmixregisteredandunbufferedDIMMsintheserver.
•DonotmixloadreducedDIMMswithothertypesofDIMMsintheserver.
•DOnotmixECCandnon-ECCDIMMsintheserver.
•Theserversupports1.35-volt(low-voltage)and1.5-voltDIMMs.
•Theserversupportsamaximumof16DIMMs(single-rankanddual-rank)onthebasesystemboard.
•TheDIMMoptionsthatareavailablefortheserverare4GB,8GB,16GB,and32GB(whenavailable).
•Theserversupportsmemorysparing.Memorysparingreservesmemorycapacityforfailoverintheevent
ofaDIMMfailure,andthereservedcapacityisdeductedfromthetotalavailablememory.Memorysparing
provideslessredundancythanmemorymirroringdoes.Ifapredeterminedthresholdofcorrectableerrors
isreached,thecontentsofthefailingDIMMarecopiedtothesparememory,andthefailingDIMMorrank
isdisabled.ToenablememorysparingthroughtheSetuputility,selectSystemSettings>Memory.
56LenovoSystemx3650M4BDInstallationandServiceGuide