Lenovo System x3250 M4 - Page 40

(SDRAM)dualinlinememorymodules(DIMMs)witherrorcorrectingcode(ECC).Foralistofsupported
optionsfortheserver,seehttp://www.lenovo.com/serverproven/;then,selectyourcountryandnavigate
tothelistofoptionsfortheserver.
•Themaximumamountofmemorythattheserversupportsisdependentonthetypeofmemorythat
youinstallintheserver.
•Theamountofusablememoryisreduced,dependingonthesystemconfiguration.Acertainamountof
memorymustbereservedforsystemresources.Toviewthetotalamountofinstalledmemoryandthe
amountofconfiguredmemory,runtheSetuputility.Foradditionalinformation,see“UsingtheSetup
utility”onpage64
.
•ThemaximumoperatingspeedoftheserverisdeterminedbytheslowestDIMMintheserver.
•IfyouinstallapairofDIMMsinDIMMconnectors1and3,thesizeandspeedoftheDIMMsthatyou
installinDIMMconnectors1and3mustmatcheachother.However,theydonothavetobethesame
sizeandspeedastheDIMMsthatareinstalledinDIMMconnectors2and4.
•YoucanusecompatibleDIMMsfromvariousmanufacturersinthesamepair.
•WhenyouinstallorremoveDIMMs,theserverconfigurationinformationchanges.Whenyourestartthe
server,thesystemdisplaysamessagethatindicatesthatthememoryconfigurationhaschanged.Static
electricitythatisreleasedtointernalservercomponentswhentheserverispowered-onmightcause
theservertostop,whichcouldresultinthelossofdata.Toavoidthispotentialproblem,alwaysusean
electrostatic-dischargewriststraporothergroundingsystemwhenworkinginsidetheserverwiththe
poweron.
Attention:Staticelectricitythatisreleasedtointernalservercomponentswhentheserverispowered-on
mightcausetheservertostop,whichcouldresultinthelossofdata.Toavoidthispotentialproblem,
alwaysuseanelectrostatic-dischargewriststraporothergroundingsystemwhenworkinginsidethe
serverwiththepoweron.
•ThespecificationsofaDDR3DIMMareonalabelontheDIMM,inthefollowingformat.
gggeRxff-PC3-wwwwwm-aa-bb-cc
where:
–gggisthetotalcapacityoftheDIMM(forexample,1GB,2GB,or4GB)
–eisthenumberofranks
–1=single-rank
–2=dual-rank
–4=quad-rank
–ffisthedeviceorganization(bitwidth)
–4=x4organization(4DQlinesperSDRAM)
–8=x8organization
–16=x16organization
–wwwwwistheDIMMbandwidth,inMBps
–8500=8.53GBps(PC3-1066SDRAMs,8-byteprimarydatabus)
–10600=10.66GBps(PC3-1333SDRAMs,8-byteprimarydatabus)
–12800=12.8GBps(PC3-1600SDRAMs,8-byteprimarydatabus)
–mistheDIMMtype
–E=UnbufferedDIMM(UDIMM)withECC(x72-bitmoduledatabus)
–R=RegisteredDIMM(RDIMM)
–U=UnbufferedDIMMwithnoECC(x64-bitprimarydatabus)
26LenovoSystemx3250M4InstallationandServiceGuide