SuperServer 6029U-T Series User's Manual
36
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
Config. Set A
DIMM0/DIMM1
Config. Set B
DIMM0/DIMM1
Config. Set C
Possible Mixes
DIMM0/DIMM1
Within
IMC DIMM
Population
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
configurations)
None or same as
DDR1 (excludes
DIMM 1 in 5DIMM
configurations)
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
Possible Mixes
DIMM0/DIMM1
Within
IMC DIMM
Population
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
LRDIMM
DIMM0/DIMM1
Possible Mixes
DIMM0/DIMM1
Within
IMC DIMM
Population
DDR0
x4, None, x4, x4
Quad Rank, None
Quad Rank, Quad Rank
DDR1
None or same as DDR0
DDR2
None or same as DDR1
Requirements:
Match DIMM types installed across DDR channels within an IMC; always
populate IMC0 first.
