Lenovo System x3550 M4 - Page 230

–Two1.35Vsingle-rank,dual-ranl,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:
Table20.MaximummemoryinstallationusingrankedDIMMs
NumberofDIMMsDIMMtypeDIMMsizeTotalmemory
16Dual-rankUDIMM
4GB64GB
24
Single-rankRDIMM2GB48GB
24
Single-rankRDIMM4GB96GB
24Dual-rankRDIMM
4GB96GB
24Dual-rankRDIMM
8GB192GB
24Dual-rankRDIMM
16GB384GB
16
Quad-rankRDIMM8GB128GB
24
Quad-rankLRDIMM32GB768GB
•TheUDIMMoptionthatisavailablefortheserveris4GB.Theserversupportsaminimumof4GBanda
maximumof64GBofsystemmemoryusingUDIMMs.
•TheRDIMMoptionsthatareavailablefortheserverare2GB,4GB,8GB,and16GB.Theserver
supportsaminimumof2GBandamaximumof384GBofsystemmemoryusingRDIMMs.
•TheLRDIMMoptionthatisavailablefortheserveris32GB.Theserversupportsaminimumof32GB
andamaximumof768GBofsystemmemoryusingLRDIMMs.
Note:Theamountofusablememoryisreduceddependingonthesystemconfiguration.Acertain
amountofmemorymustbereservedforsystemresources.Toviewthetotalamountofinstalledmemory
andtheamountofconfiguredmemory,runtheSetuputility.Foradditionalinformation,see“Configuring
theserver”onpage94
.
•AminimumofoneDIMMmustbeinstalledforeachmicroprocessor.Forexample,youmustinstalla
minimumoftwoDIMMsiftheserverhastwomicroprocessorsinstalled.However,toimprovesystem
performance,installaminimumoffourDIMMsforeachmicroprocessor.
•DIMMsintheservermustbethesametype(RDIMM,UDIMM,orLRDIMM)toensurethattheserver
willoperatecorrectly.
•Whenyouinstallonequad-rankDIMMinachannel,installitintheDIMMconnectorfurthestawayfrom
themicroprocessor.
Notes:
1.YoucaninstallDIMMsformicroprocessor2assoonasyouinstallmicroprocessor2;youdonothave
towaituntilalloftheDIMMslotsformicroprocessor1arefilled.
2.DIMMslots13-24arereservedformicroprocessor2;thus,DIMMslots13-24areenabledwhen
microprocessor2isinstalled.
ThefollowingillustrationshowsthelocationoftheDIMMconnectorsonthesystemboard.
216Systemx3550M4InstallationandServiceGuide