Lenovo System x3250 M5 - Unbuffered Dimms (Udimms)

•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”onpage86
.
ThefollowingillustrationshowsthelocationoftheDIMMconnectorsonthesystemboard.
Figure50.ThelocationoftheDIMMconnectorsonthesystemboard
ThefollowingsectionsprovideadditionalinformationspecifictounbufferedandregisteredDIMMsthat
youmustconsider.
UnbufferedDIMMs(UDIMMs)
ThefollowingnotesprovideinformationthatyoumustconsiderwhenyouinstallUDIMMs.
56LenovoSystemx3250M5InstallationandServiceGuide