Specifications

17
2INSTALLING MEMORY MODULES
Supported DIMM combinations
ThereareeightDIMMsockets(dualinlinememorymodules)ontheCPMforinstallingVLP
DDR3registeredECCDIMMs.InFigure 2,thesocketsaregroupedintothreechannels.
WheninstallingDIMMs,beginbypopulatingthechannelsthatarefarthestfromtheCPU.
BalanceDIMMsacrossthechannelsbypopulatingslot0foreachchannelfirst,followed
byslot1,andthenslot2.ThepreferredmemoryconfigurationsarelistedinTable 1.
TheCPU’sintegratedmemorycontrollersupportsuptothreechannelsofDDR3DIMMs,
using64databitsand8ECCbitsperchannel.EachchannelsupportsuptothreeDIMMs
(single,dualandquad‐rankDIMMs)andsupportsDRAMspeedsof800MHzand
1066MHzwiththefollowinglimitations:
•ThreeDIMMsperchannelonlysupportsingleanddual‐rankDIMMsat800 MHz.
•At1066MHz,onlytwoDIMMsperchannelareallowedforsingle anddual‐rank.
•Forquad‐rank,onlyoneDIMMperchannelisallowedatanyspeed.
Note:OptimummemoryperformanceisonlyachievedwhenDIMMsofidenticalrankand
sizeareinstalledequallyinallthreechannels.
Figure 2. DIMM slots and channels
Table 1. Preferred memory population options
Number of DIMMs DIMM Type Channels Populated
3 Single-rank C0, B0, A0
3 Dual-rank C0, B0, A0
6 Single-rank C0, C1, B0, B1, A0, A1
6 Dual-rank C0, C1, B0, B1, A0, A1
8 Dual-rank C0, C1, B0, B1, B2, A0, A1, A2
a
a
This configuration yields maximum memory.
CPU
CPM Front Panel
Channel A
Channel B
Channel C
B0 B1 B2 A0 A1
A2
C1C0