Nextscale Nx360 M5 Water-Cooled - Lenovo NeXtScale nx360 M5 Installation And Service Manual

– Two 1.35 V single-rank, dual-ranl, or quad-rank RDIMMs or LRDIMMs are installed in the same
channel. In the Setup utility, Memory speed is set to Max performance and LV-DIMM power is set to
Enhance performance mode. The 1.35 V UDIMMs, RDIMMs or LRDIMMs will function at 1.5 V.
• The compute node supports a maximum of 16 single-rank, dual–rank RDIMMs or 16 quad-rank LRIMMs.
• The following table shows an example of the maximum amount of memory that you can install using
ranked DIMMs:
Table 21. Maximum memory installation using ranked DIMMs
Number of DIMMs
16
16
16
16
16
• 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 per CPU and a maximum of 256 GB of system memory using RDIMMs.
• The LRDIMM option that is available for the server is 32 GB. The compute node supports a minimum of 32
GB per CPU and a maximum of 512 GB of system memory using LRDIMMs
• 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 to ensure that the compute node will operate
correctly.
• The memory rank sparing mode requires an even number of DIMMs. If your server has an odd number of
DIMMs installed, ensure that you disable the memory rank sparing mode from the Memory menu in Setup
Utility. See "Using the Setup utility" on page 34 for more information.
Note: After disabling the memory rank sparing mode, if a message prompts that the memory
configuration is not valid, restart the integrated management module 2.1 (IMM2.1). Alternatively, you can
turn off the server, disconnect it from and then reconnect it to ac power, and then turn on the server again.
• 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 9-16 are reserved for microprocessor 2; thus, DIMM slots 9-16 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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Lenovo NeXtScale nx360 M5 water-cooled technology tray Lenovo NeXtScale n1200 Enclosure Installation and Service Guide
DIMM type
Single-rank RDIMM
Single-rank RDIMM
Dual-rank RDIMM
Dual-rank RDIMM
Quad-rank LRDIMM
DIMM size
4 GB
8 GB
8 GB
16 GB
32 GB
Total memory
64 GB
128 GB
128 GB
256 GB
512 GB