Lenovo System x3550 M5 - Page 175

x4=x4organization(4DQlinesperSDRAM)
x8=x8organization
x16=x16organization
–vistheSDRAMandsupportcomponentsupplyvoltage(VDD)
•Blank=1.2Vspecified
–wwwwwistheDIMMbandwidth,inMBps
12800=12.80GBps(DDR4-1600SDRAMs,8-byteprimarydatabus)
14900=14.93GBps(DDR4-1866SDRAMs,8-byteprimarydatabus)
17000=17.00GBps(DDR4-2133SDRAMs,8-byteprimarydatabus)
19200=19.20GBps(DDR4-2400SDRAMs,8-byteprimarydatabus)
–mistheDIMMtype
L=LoadReductionDIMM(LRDIMM)
R=RegisteredDIMM(RDIMM)
–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).
•ThefollowingrulesapplytoDDR4RDIMMspeedasitrelatestothenumberofRDIMMsinachannel:
–Whenyouinstall1RDIMMperchannel,thememoryrunsat2400MHz.
–Whenyouinstall2RDIMMsperchannel,thememoryrunsat2400MHz.
–Whenyouinstall3RDIMMsperchannel,thememorymayrunat1866MHz.
–Allchannelsinaserverrunatthefastestcommonfrequency.
–Donotinstallregistered,unbuffered,andloadreductionDIMMsinthesameserver.
•Themaximummemoryspeedisdeterminedbythecombinationofthemicroprocessor,DIMMspeed,
DIMMtype,OperatingModesinUEFIsettings,andthenumberofDIMMsinstalledineachchannel.
•Intwo-DIMM-per-channelconfiguration,theserverautomaticallyoperateswithamaximummemory
speedofupto2400MHzwhenthefollowingconditionismet:
–Two1.35Vsingle-rank,dual-rank,orquad-rankRDIMMsorLRDIMMsareinstalledinthesame
channel.IntheSetupUtility,MemoryspeedissettoMaxperformanceandLV-DIMMpowerisset
toEnhanceperformancemode.The1.35VRDIMMsorLRDIMMswillfunctionat1.5V.
•Theserversupportsamaximumof24single-rank,dual-rankRDIMMsor24quad-rankLRDIMMs.
•ItisrecommendedtoinstallDIMMswiththesamerankineachchannel.
•Thefollowingtableshowsanexampleofthemaximumamountofmemorythatyoucaninstallusing
RDIMMsorLRDIMMs:
Table25.Maximummemoryinstallation
NumberofDIMMsDIMMtypeSizeTotalmemory
24
Single-rankRDIMM8GB192GB
24Dual-rankRDIMM
8GB192GB
Chapter5.Removingandreplacingcomponents161