Computer Hardware User Manual

Notes:
•Allmemorymodulestobeinstalledonaservermustbethesametype.
•Whenyouinstallmemorymoduleswithdifferentranksinonechannel,startfromthefarthestmemoryslot
inthechannelandinstallthememorymodulethathasthemostranksrst.
•When1.35Vmemorymodulesand1.50Vmemorymodulesareinstalledintothememoryslotsforthe
samemicroprocessor,allthememorymodulesrunat1.50V.
•Whenmemorymoduleswithdifferentfrequenciesareinstalledintothememoryslotsforthesame
microprocessor,allthememorymodulesrunatthelowestfrequency.
•Itisrecommendedthatyouinstallthehigh-frequencymemorymodulesintothememoryslotsforthe
samemicroprocessortoensurehighperformance.
Figure42.CPU1DIMMsandCPU2DIMMs
Table4.Memorymoduleinstallationrulesforserverswithtwomicroprocessors
CPU1DIMMCPU2DIMM
A1A2A3B1B2B3
C1C2C3
D1D2D3A1A2B1B2
C1C2
D1D2
TwoDIMMsXX
FourDIMMsXXXX
SixDIMMs
XXXXXX
EightDIMMsXXXXXXXX
TwelveDIMMsXXXXXXXXXXXX
SixteenDIMMs
XXXXXXXXXXXXXXXX
TwentyDIMMsXXXXXXXXXXXXXXXXXXXX
Note:The20DIMMscongurationissupportedonlywhenyouareusingnormalRDIMMs.
78ThinkServerRD540UserGuideandHardwareMaintenanceManual