Plugging rules for memory modules in the
9105-22A, 9105-22B, or 9786-22H system
Find information about the configurations and rules that apply to memory modules for the IBM Power
S1022 (9105-22A), IBM Power
S1022s (9105-22B), and IBM Power
L1022 (9786-22H) 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, or 128
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 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, and feature
codes for the 9105-22A and 9105-22B systems
Size
Type
Feature code
16 GB
DDR4
EM6N
32 GB
DDR4
EM6W
64 GB
DDR4
EM6X
128 GB
DDR4
EM6Y
Table 2. DDR5 memory sizes, types, and feature codes for the 9105-22A and 9105-22B
systems
Size
Type
Feature code
32 GB
DDR5
EMFA
64 GB
DDR5
EMFB
128 GB
DDR5
EMFC
Table 3. DDR4 memory sizes, types, and feature codes
for the 9786-22H system
Size
Type
Feature code
16 GB
DDR4
EM7N
32 GB
DDR4
EM7W
64 GB
DDR4
EM7X
DDR4
EMRX
128 GB
DDR4
EM7Y
DDR4
EMRY
Table 4. DDR5
memory sizes, types, and feature codes for the 9786-22H
system
Size
Type
Feature code
32 GB
DDR5
EMFR
64 GB
DDR5
EMFS
DDR5
EMFU
128 GB
DDR5
EMFT
DDR5
EMFV
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 two-processor9105-22B 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-C21, P0-C40
6
3
2
P0-C12, P0-C13
8
4
2
P0-C19, P0-C20
10
5
2
P0-C28, P0-C29
12
6
2
P0-C38, P0-C39
14
7
2
P0-C30, P0-C31
16
8
2
P0-C41, P0-C42
Note:
All memory module locations must be the same feature code.
Table 8. Plugging sequence for
memory modules in a two-processor9105-22B with two DDIMM Feature Codes (FC
A and FC B)
Total memory modules
Sequence
Memory modules to install
Memory module feature code
Memory locations
4
1
4
DDIMM FC A
P0-C27, P0-C32
DDIMM FC B
P0-C21, P0-C40
8
2
4
DDIMM FC A
P0-C12, P0-C13
DDIMM FC B
P0-C19, P0-C20
13
3
4
DDIMM FC A
P0-C28, P0-C29
DDIMM FC B
P0-C38, P0-C39
16
4
4
DDIMM FC A
P0-C30, P0-C31
DDIMM FC B
P0-C41, P0-C42
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 9. 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 10. 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.
