Lenovo NeXtScale nx360 M4 Installation And Service Manual page 146

• The compute node supports a maximum of 8 dual-rank RDIMMs. The compute node supports up to one
RDIMMs per channel.
• The following table shows an example of the maximum amount of memory that you can install using
ranked DIMMs:
Table 17. Maximum memory installation using ranked DIMMs
Number of DIMMs
8
8
8
8
8
8
• The UDIMM option that is available for the compute node is 4 GB. The compute node supports a
minimum of 4 GB and a maximum of 32 GB of system memory using UDIMMs.
• The RDIMM options that are available for the compute node are 4 GB, 8 GB, and 16 GB. The compute
node supports a minimum of 4 GB and a maximum of 128 GB of system memory using RDIMMs.
• A minimum of one DIMM must be installed for each microprocessor. For example, you must install a
minimum of two DIMMs if the compute node has two microprocessors installed. However, to improve
system performance, install a minimum of four DIMMs for each microprocessor.
• DIMMs in the compute node must be the same type (RDIMM or UDIMM) to ensure that the compute
node will operate correctly.
• When you install one quad-rank DIMM in a channel, install it in the DIMM connector furthest away from
the microprocessor.
Notes:
1. You can install DIMMs for microprocessor 2 as soon as you install microprocessor 2; you do not have
to wait until all of the DIMM slots for microprocessor 1 are filled.
2. DIMM slots 5-8 are reserved for microprocessor 2; thus, DIMM slots 5-8 are enabled when
microprocessor 2 is installed.
The following illustration shows the location of the DIMM connectors on the system board.
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IBM NeXtScale nx360 M4 Installation and Service Guide
DIMM type
Dual-rank UDIMM
Single-rank RDIMM
Dual-rank RDIMM
Single-rank RDIMM
Dual-rank RDIMM
Dual-rank RDIMM
DIMM size
4 GB
4 GB
4 GB
8 GB
8 GB
16 GB
Total memory
32 GB
32 GB
32 GB
64 GB
64 GB
128 GB