Lenovo System x3550 M4 - DIMM Installation Sequence; Memory Mirrored Channel

1.YoucaninstallDIMMsformicroprocessor2assoonasyouinstallmicroprocessor2;youdonothave
towaituntilalloftheDIMMslotsformicroprocessor1arefilled.
2.DIMMslots13-24arereservedformicroprocessor2;thus,DIMMslots13-24areenabledwhen
microprocessor2isinstalled.
ThefollowingillustrationshowsthelocationoftheDIMMconnectorsonthesystemboard.
Figure35.DIMMconnectorslocation
DIMMinstallationsequence
Dependingontheservermodel,theservermaycomewithaminimumofone2GBor4GBDIMMinstalled
inslot1.WhenyouinstalladditionalDIMMs,installthemintheordershowninthefollowingtableto
optimizesystemperformance.
Ingeneral,allthreechannelsonthememoryinterfaceforeachmicroprocessorcanbepopulatedinany
orderandhavenomatchingrequirements.
Table6.NormalmodeDIMMinstallationsequence
Numberofinstalled
microprocessorDIMMconnectorpopulationsequence
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.
48Systemx3550M4InstallationandServiceGuide