Supermicro Superserver - Page 32

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Chapter 3: Maintenance and Component Installation
General Population Requirements
DIMM Mixing Rules
• All DIMMs must be DDR4 DIMMs only.
• X4 and X8 DIMMs can be mixed in the same channel.
• Mixing of LRDIMMs and RDIMMs is not allowed in the same channel, across different channels, and across
different sockets.
• Mixing of non-3DS and 3DS LRDIMM is not allowed in the same channel, across different channels, and across
different sockets.
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 NotAllowed Allowed
DDR4 Only Socket Level Population Requirements
DDR4 Socket Level Minimum Population Requirements
• There should be at least one DDR4 DIMM per socket.
• If only one DIMM is populated in a channel, then populate it in the slot furthest away from CPU.
• Always populate DIMMs with a higher electrical loading in DIMM0 followed by DIMM1.
DDR4 Only Memory Populations with Possible Mixes
DDR4 RDIMM DIMM0/DIMM1
Cong. Set A
DIMM0/DIMM1
Cong. Set B
DIMM0/DIMM1 Con-
g. Set C
Possible Mixes
DIMM0/DIMM1
Within
IMC
DIMM
Popula-
tion
DDR0 x8, None, x8, x8 x4, None, x4, x4 x8, x4, or x4, x8 Single Rank, None
Single Rank, Single Rank
Dual Rank, Single Rank,
Dual Rank, None
Dual Rank, Dual Rank,
Single Rank, Single Rank
DDR1 None or same as
DDR0
None or same as
DDR0
None or same as
DDR0
DDR2 None or same as
DDR1 (excludes
DIMM 1 in 5DIMM

None or same as
DDR1 (excludes
DIMM 1 in 5DIMM

None or same as
DDR1 (excludes DIMM
-
tions)
DDR4 Only Memory Populations with Possible Mixes
3DS LRDIMM or 3DS RDIMM DIMM0/DIMM1 Cong. Set A Possible Mixes
DIMM0/DIMM1
Within IMC
DIMM Popu-
lation
DDR0 x4, None, x4, x4 Quad Rank, None
Quad Rank, Quad Rank
Cannot mix 3DS LRDIMM and RDIMM
DDR1 None or same as DDR0
DDR2 None or same as DDR1
DDR4 Only Memory Populations with Possible Mixes
LRDIMMs DIMM0/DIMM1 Possible Mixes
DIMM0/DIMM1
Within IMC
DIMM Popu-
lation
DDR0 x4, None, x4, x4 Quad Rank, None
Quad Rank, Quad Rank
Note: Requirements
*Match DIMM types installed across DDR
channels within an IMC

DDR1 None or same as DDR0
DDR2 None or same as DDR1