Lenovo System x3500 M5 Type 5464 - Page 90

4R=quad-rank
–xffisthedeviceorganization(bitwidth)
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)
–mistheDIMMtype
L=LoadReductionDIMM(LRDIMM)
R=RegisteredDIMM(RDIMM)
–aaistheCASlatency,inclocksatmaximumoperatingfrequency
–bbistheJEDECSPDRevisionEncodingandAdditionslevel
–ccisthereferencedesignfileforthedesignoftheDIMM
–distherevisionnumberofthereferencedesignoftheDIMM
Note:TodeterminethetypeofaDIMM,seethelabelontheDIMM.Theinformationonthelabelisin
theformatxxxxxnRxxxPC4v-xxxxxx-xx-xx-xxx.Thenumeralinthesixthnumericalpositionindicates
whethertheDIMMissingle-rank(n=1),dual-rank(n=2),orquad-rank(n=4).
•ThefollowingrulesapplytoDDR4RDIMMspeedasitrelatestothenumberofRDIMMsinachannel:
–Whenyouinstall1RDIMMperchannel,thememoryrunsat2133MHz
–Whenyouinstall2RDIMMsperchannel,thememoryrunsat1866MHz
–Whenyouinstall3RDIMMsperchannel,thememoryrunsat1600MHz
–Allchannelsinaserverrunatthefastestcommonfrequency
–DonotinstallregisteredandloadreductionDIMMsinthesameserver
•ThefollowingrulesapplytoDDR4RDIMMspeedasitrelatestothenumberofLRDIMMsinachannel:
–Whenyouinstall1LRDIMMperchannel,thememoryrunsat2133MHz
–Whenyouinstall2LRDIMMsperchannel,thememoryrunsat2133MHz
–Whenyouinstall3LRDIMMsperchannel,thememoryrunsat1600MHz
•Themaximummemoryspeedisdeterminedbythecombinationofthemicroprocessor,DIMMspeed,
DIMMtype,OperatingModesinUEFIsettings,andthenumberofDIMMsinstalledineachchannel.
•Theserversupportsamaximumof24single-rank,dual-rankRDIMMsor24quad-rankLRIMMs.
•ItisrecommendedtoinstallDIMMswiththesamerankineachchannel.
•Thefollowingtableshowsanexampleofthemaximumamountofmemorythatyoucaninstallusing
rankedDIMMs:
74Systemx3500M5InstallationandServiceGuide