Lenovo System x3650 M5 - Page 184

–ThespecificationsofaDDR4DIMMareonalabelontheDIMM,inthefollowingformat.
gggggeRxffPC4v-wwwwwm-aa-bb-ccd
where:
–gggggisthetotalcapacityoftheDIMM(forexample,1GB,2GB,or4GB)
–eRisthenumberofranks
1R=single-rank
2R=dual-rank
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)
19200=19.20Gbps(DDR4-2400SDRAMs,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).
•Thefollowingrulesapplyto2400MHzDDR4RDIMMspeedasitrelatestothenumberofRDIMMsin
achannel:
–Whenyouinstall1RDIMMperchannel,thememoryrunsat2400MHz
–Whenyouinstall2RDIMMsperchannel,thememoryrunsat2400MHz
–Whenyouinstall3RDIMMsperchannel,thememoryrunsat1866MHz
–Allchannelsinaserverrunatthefastestcommonfrequency
–DonotinstallregisteredandloadreductionDIMMsinthesameserver
•Thefollowingrulesapplyto2400MHzDDR4LRDIMMspeedasitrelatestothenumberofLRDIMMsin
achannel:
–Whenyouinstall1LRDIMMperchannel,thememoryrunsat2400MHz
–Whenyouinstall2LRDIMMsperchannel,thememoryrunsat2400MHz
–Whenyouinstall3LRDIMMsperchannel,thememoryrunsat2133MHz
172LenovoSystemx3650M5InstallationandServiceGuide