Lenovo System x3500 M4 - Page 278

–Two1.35Vsingle-rank,dual-rank,orquad-rankUDIMMs,RDIMMsorLRDIMMsareinstalledinthe
samechannel.IntheSetuputility,MemoryspeedissettoMaxperformanceandLV-DIMMpoweris
settoEnhanceperformancemode.The1.35VUDIMMs,RDIMMsorLRDIMMswillfunctionat1.5V.
•Theserversupportsamaximumof16dual-rankUDIMMs.TheserversupportsuptotwoUDIMMs
perchannel.
•Theserversupportsamaximumof24single-rank,dual-rank,or16quad-rankRDIMMs.Theserverdoes
notsupportthreequad-rankRDIMMsinthesamechannel.
•Thefollowingtableshowsanexampleofthemaximumamountofmemorythatyoucaninstallusing
rankedDIMMs:
Table35.MaximummemoryinstallationusingrankedDIMMs
NumberofDIMMsDIMMtypeDIMMsizeTotalmemory
16
Single-rankUDIMMs2GB32GB
24
Single-rankRDIMMs2GB48GB
24
Single-rankRDIMMs4GB96GB
24Dual-rankRDIMMs
8GB192GB
24Dual-rankRDIMMs
16GB384GB
16
Quad-rankRDIMMs16GB256GB
24
Quad-rankLRDIMMs32GB768GB
•TheUDIMMoptionthatisavailablefortheserveris2GB.Theserversupportsaminimumof2GBanda
maximumof32GBofsystemmemoryusingUDIMMs.
•TheRDIMMoptionsthatareavailablefortheserverare2GB,4GB,8GB,and16GB.Theserver
supportsaminimumof2GBandamaximumof384GBofsystemmemoryusingRDIMMs.
•TheLRDIMMoptionthatisavailablefortheserveris32GB.Theserversupportsaminimumof32GB
andamaximumof768GBofsystemmemoryusingLRDIMMs.
Note:Theamountofusablememoryisreduceddependingonthesystemconfiguration.Acertain
amountofmemorymustbereservedforsystemresources.Toviewthetotalamountofinstalledmemory
andtheamountofconfiguredmemory,runtheSetuputility.Foradditionalinformation,see“Configuring
theserver”onpage104
.
•AminimumofoneDIMMmustbeinstalledforeachmicroprocessor.Forexample,youmustinstalla
minimumoftwoDIMMsiftheserverhastwomicroprocessorsinstalled.However,toimprovesystem
performance,installaminimumoffourDIMMsforeachmicroprocessor.
•DIMMsintheservermustbethesametype(RDIMM,UDIMM,orLRDIMM)toensurethattheserver
willoperatecorrectly.
•Whenyouinstallonequad-rankDIMMinachannel,installitintheDIMMconnectorfurthestawayfrom
themicroprocessor.
•ForUDIMMs,DIMMconnectors3,6,7,and10formicroprocessor1andDIMMconnectors15,18,
19,and22formicroprocessor2arenotused.
Note:YoucaninstallDIMMsformicroprocessor2assoonasyouinstallmicroprocessor2;youdonothave
towaituntilalloftheDIMMslotsformicroprocessor1arefilled.
ThefollowingillustrationshowsthelocationoftheDIMMconnectorsontheysystemboard.
264Systemx3500M4InstallationandServiceGuide