Lenovo x3550 M5 - DIMM Installation Sequence; Memory Mirrored Channel

Microprocessor 1
CPU1
Microprocessor 2
CPU2
Figure83.DIMMconnectorslocation
DIMMinstallationsequence
Dependingontheservermodel,theservermaycomewithaminimumofone2GBor4GBDIMMinstalled
inslot1.WhenyouinstalladditionalDIMMs,installthemintheordershowninthefollowingtableto
optimizesystemperformance.
Ingeneral,allfourchannelsonthememoryinterfaceforeachmicroprocessorcanbepopulatedinanyorder
andhavenomatchingrequirements.
Table27.NormalmodeDIMMinstallationsequence
Numberofinstalled
microprocessorsDIMMconnectorpopulationsequence
Onemicroprocessorinstalled
1,4,9,12,2,5,8,11,3,6,7,10
Twomicroprocessorsinstalled1,13,4,16,9,21,12,24,2,14,5,17,8,20,11,23,3,15,6,18,7,19,10,22
Memorymirroredchannel
MemorymirroredchannelmodereplicatesandstoresdataontwopairsofDIMMswithintwochannels
simultaneously.
Ifafailureoccurs,thememorycontrollerswitchesfromtheprimarypairofmemoryDIMMstothebackup
pairofDIMMs.ToenablememorymirroredchannelthroughtheSetuputility,selectSystemSettings➙
Memory.Formoreinformation,see“UsingtheSetuputility”onpage36.Whenyouusethememory
mirroredchannelfeature,considerthefollowinginformation:
•Whenyouusememorymirroredchannel,youmustinstallapairofDIMMsatatime.ThetwoDIMMsin
eachpairmustbeidenticalinsize,type,andrank(single,dual,orquad),andorganization,butnotin
speed.ThechannelsrunatthespeedoftheslowestDIMMinanyofthechannels.
Chapter5.Removingandreplacingcomponents163