Supermicro 34140315 User Manual page 31

General Population Requirements
•
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
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
Config. Set A
Within DDR0 x8, None, x8, x8
IMC
DDR1 None or same as
DIMM
DDR0
Popula-
tion
DDR2 None or same as
DDR1 (excludes
DIMM 1 in 5DIMM
configurations)
DDR4 Only Memory Populations with Possible Mixes
3DS LRDIMM or 3DS RDIMM DIMM0/DIMM1 Config. Set A
Within IMC DDR0
DIMM Popu-
DDR1
lation
DDR2
DDR4 Only Memory Populations with Possible Mixes
LRDIMMs
Within IMC DDR0
DIMM Popu-
DDR1
lation
DDR2
Chapter 3: Maintenance and Component Installation
DIMM Mixing Rules
RDIMM LRDIMM
Allowed Not Allowed
Not Allowed Allowed
Not Allowed NotAllowed
DIMM0/DIMM1 DIMM0/DIMM1 Con-
Config. Set B fig. Set C
x4, None, x4, x4 x8, x4, or x4, x8
None or same as None or same as
DDR0 DDR0
None or same as None or same as
DDR1 (excludes DDR1 (excludes DIMM
DIMM 1 in 5DIMM 1 in 5DIMM configura-
configurations) tions)
x4, None, x4, x4
None or same as DDR0
Cannot mix 3DS LRDIMM and RDIMM
None or same as DDR1
DIMM0/DIMM1
x4, None, x4, x4
None or same as DDR0
Note: Requirements
*Match DIMM types installed across DDR
None or same as DDR1
channels within an IMC
*Always populate iMC0 first
31
3DS LRDIMM
Not Allowed
Not Allowed
Allowed
Possible Mixes
DIMM0/DIMM1
Single Rank, None
Single Rank, Single Rank
Dual Rank, Single Rank,
Dual Rank, None
Dual Rank, Dual Rank,
Single Rank, Single Rank
Possible Mixes
DIMM0/DIMM1
Quad Rank, None
Quad Rank, Quad Rank
Possible Mixes
DIMM0/DIMM1
Quad Rank, None
Quad Rank, Quad Rank