Plugging rules for memory modules in the
9105-41B, 9105-42A, or 9786-42H system
Find information about the configurations and rules that apply to memory modules for the IBM Power
S1014 (9105-41B), IBM Power
S1024 (9105-42A), and IBM Power
L1024 (9786-42H) system.
This information helps you to plan memory module installation in the
system.
The system supports memory modules of 16 GB, 32 GB, 64 GB, 128 GB, or 256 GB.
A maximum of two memory module feature codes are supported on a system.
Equal quantities of the two memory module feature codes is not
required.
The system supports two heights of memory: 2U and 4U. In the system, all the memory must be the same height.
When the system has an RDX drive, 4U memory heights are not supported; only 2U memory heights can be used.
The system does not support mixing DDR4 and DDR5 memory modules.
The following tables list the feature codes of the supported memory modules.
Table 1. DDR4 memory sizes, types, feature codes, and heights for the
9105-41B and 9105-42A systems
Size
Type
Feature code
Height
16 GB
DDR4
EM6N
2U
32 GB
DDR4
EM6W
2U
64 GB
DDR4
EM6X
2U
128 GB
DDR4
EM6Y (9105-41B only)
2U
128 GB
DDR4
EM6U (9105-42A only)
4U
256 GB
DDR4
EM78 (9105-42A only)
4U
Table 2. DDR5 memory sizes,
types, feature codes, and heights for the 9105-41B and
9105-42A systems
Size
Type
Feature code
Height
32 GB
DDR5
EMFA
2U
64 GB
DDR5
EMFB
2U
128 GB
DDR5
EMFD
4U
256 GB
DDR5
EMFE (9105-42A only)
4U
Table 3. DDR4 memory sizes, types, feature codes, and
heights for the 9786-42H system
Size
Type
Feature code
Height
16 GB
DDR4
EM7N
2U
32 GB
DDR4
EM7W
2U
64 GB
DDR4
EM7X
2U
DDR4
EMRX
128 GB
DDR4
EM6V
4U
DDR4
EMRV
256 GB
DDR4
EM7F
4U
DDR4
EMRF
Table 4. DDR5 memory
sizes, types, feature codes, and heights for the 9786-42H
system
Size
Type
Feature code
Height
32 GB
DDR5
EMFR
2U
64 GB
DDR5
EMFS
2U
DDR5
EMFU
128 GB
DDR5
EMFF
4U
DDR5
EMFW
256 GB
DDR5
EMFG
4U
DDR5
EMFX
The following figure shows the memory module locations.Figure 1. Finding the memory module locations
Refer to the following tables for memory module plugging sequences and locations for your
system.
Table 5. Plugging sequence for
memory modules in a two-processor9105-22A, 9786-22H, 9105-42A, or
9786-42H with a single DDIMM Feature
Code
Total memory modules
Sequence
Memory modules to install
Memory locations
4
1
4
P0-C21, P0-C27, P0-C32, P0-C40
8
2
4
P0-C16, P0-C35, P0-C43, P0-C48
12
3
4
P0-C12, P0-C13, P0-C19, P0-C20
16
4
4
P0-C17, P0-C18, P0-C25, P0-C26
20
5
4
P0-C28, P0-C29, P0-C38, P0-C39
24
6
4
P0-C36, P0-C37, P0-C46, P0-C47
28
7
4
P0-C30 P0-C31, P0-C41, P0-C42
32
8
4
P0-C33, P0-C34, P0-C44, P0-C45
Note:
All memory module locations must be the same feature code.
Table 6. Plugging sequence for
memory modules in a two-processor9105-22A, 9786-22H, 9105-42A, or
9786-42H with two DDIMM Feature Codes (FC A
and FC B)
Total memory modules
Sequence
Memory modules to install
Memory module feature code
Memory locations
8
1
8
DDIMM FC A
P0-C16, P0-C27, P0-C32, P0-C35
DDIMM FC B
P0-C21, P0-C40, P0-C43, P0-C48
16
2
8
DDIMM FC A
P0-C12, P0-C13, P0-C17, P0-C18
DDIMM FC B
P0-C19, P0-C20, P0-C25, P0-C26
24
3
8
DDIMM FC A
P0-C28, P0-C29, P0-C36, P0-C37
DDIMM FC B
P0-C38, P0-C39, P0-C46, P0-C47
32
4
8
DDIMM FC A
P0-C30, P0-C31, P0-C33, P0-C34
DDIMM FC B
P0-C41, P0-C42, P0-C44, P0-C45
Note:
Maximum of two feature codes is supported.
Equal quantities of the two feature codes is not required.
All memory module locations for DDIMM FC A must be the same feature code.
All memory module locations for DDIMM FC B must be the same feature code.
The system does not support mixing DDR4 and DDR5 memory modules.
Table 7. Plugging sequence for
memory modules in a one-processor9105-22A, 9786-22H, 9105-42A, or
9786-42H with a single DDIMM Feature
Code
Total memory modules
Sequence
Memory modules to install
Memory locations
2
1
2
P0-C27, P0-C32
4
2
2
P0-C16, P0-C35
6
3
2
P0-C12, P0-C13
8
4
2
P0-C17, P0-C18
10
5
2
P0-C28, P0-C29
12
6
2
P0-C36, P0-C37
14
7
2
P0-C30 P0-C31
16
8
2
P0-C33, P0-C34
Note:
All memory module locations must be the same feature code.
Table 8. Plugging sequence
for memory modules in a one-processor9105-22B, or 9105-41B with a single DDIMM Feature
Code
Total memory modules
Sequence
Memory modules to install
Memory locations
2
1
2
P0-C27, P0-C32
4
2
2
P0-C12, P0-C13
6
3
2
P0-C28, P0-C29
8
4
2
P0-C30, P0-C31
Note:
All memory module locations must be the same feature code.
