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Chapter 2: Installation
DIMM Population Guidelines for Optimal Performance
For optimal memory performance, follow the instructions listed in the tables below when
populating memory modules.
Key Parameters for DIMM Conguration
DIMM Mixing Guidelines
General DIMM Mixing Guidelines
DIMM Mixing Rules
• All DIMMs must be all DDR4 DIMMs.
• x4 and x8 DIMMs can be mixed in the same channel.
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Key Parameters for DIMM Congurations
Parameters Possible Values
Number of Channels 1, 2, 3, 4, 5, or 6
Number of DIMMs per Channel 1DPC (1 DIMM Per Channel) or 2DPC (2 DIMMs Per Channel)
DIMM Type RDIMM (w/ECC), 3DS RDIMM, LRDIMM, 3DS LRDIMM
DIMM Construction
3DS RDIMM Raw Cards: A/B (4Rx4)
3DS LRDIMM Raw Cards: A/B (8Rx4)
Mixing of DIMM Types within a Channel
DIMM Types RDIMM LRDIMM 3DS LRDIMM
RDIMM Allowed Not Allowed Not Allowed
LRDIMM Not Allowed Allowed Not Allowed
3DS LRDIMM Not Allowed Not Allowed Allowed
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