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Memory module installation rules and order

Memory modules must be installed in a specific order based on the memory configuration that you implement and the number of processors and memory modules installed in the server.

Supported memory types

For information on the types of memory module supported by this server, see Memory section in Technical Specifications.

Information about optimizing memory performance and configuring memory is available at the Lenovo Press website:

Memory - Lenovo Press

In addition, you can take advantage of a memory configurator, which is available at the following site:

Lenovo Enterprise Solutions Configurator (Memory Configurations)

For the specific information about the required installation order of memory modules in SD535 V3 based on the system configuration and memory mode that you are implementing, see below.

Memory modules and processor layout​

Figure 1. Memory modules and processor layout
Memory module and processor location

The memory-channel configuration table below shows the relationship between the processors, memory controllers, memory channels, and memory module slot numbers.

Table 1. Memory slot and channel identification
UMC No.

8

7

11

6

10

9

3

4

0

5

1

2

Channel No.

L

K

J

I

H

G

A

B

C

D

E

F

DIMM No.

12

11

10

9

8

7

6

5

4

3

2

1

Memory module installation guideline​

Follow the rules below when installing DIMMs:

  • Mixing DIMMs from different vendors is supported in a system.

  • Mixing x4 and x8 DIMMs is not allowed in a system.

  • Mixing 3DS RDIMM and non-3DS RDIMM is not allowed in a system.

  • Mixing 4-rank 3DS RDIMM and 8-rank 3DS RDIMM is not allowed in a system.

  • Mixing 16Gbit (16GB, 32GB, 64GB) and 24Gbit (24GB, 48GB, 96GB) memory module is not allowed in a system.

  • Only single-rank and dual-rank DIMM mixing is allowed in a system.

  • When installing DIMMs with different capacity, install the DIMM with the highest capacity first following population sequence.

  • For best performance, the population recommends identical memory capacity and rank across all 12 channels.

Memory module installation order​

Note
In the following tables:

  • S1-S12 indicate DIMM slots 1-12.

  • 1-12 indicate the installation order.

The following table shows the DIMM population sequence.

Table 2. DIMM population sequence
Total DIMMsSlot number
S12S11S10S9S8S7S6S5S4S3S2S1
1 DIMM

1

2 DIMMs

2

1

4 DIMMs

4

2

1

3

6 DIMMs

4

6

2

1

5

3

8 DIMMs

8

4

6

2

1

5

3

7

10 DIMMs

8

10

4

6

2

1

5

3

9

7

12 DIMMs

12

8

10

4

6

2

1

5

3

9

7

11