IBM NeXtScale nx360 M4 Installation And Service Manual page 153

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.
v The compute node supports a maximum of 8 dual-rank UDIMMs. The compute
node supports up to one UDIMMs per channel.
v The compute node supports a maximum of 8 dual-rank RDIMMs. The compute
node supports up to one RDIMMs per channel.
v 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 DIMM type
8 Dual-rank UDIMM
8 Single-rank RDIMM
8 Dual-rank RDIMM
8 Single-rank RDIMM
8 Dual-rank RDIMM
8 Dual-rank RDIMM
v 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.
v 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.
v 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.
v DIMMs in the compute node must be the same type (RDIMM or UDIMM) to
ensure that the compute node will operate correctly.
v 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.
DIMM size
4 GB
4 GB
4 GB
8 GB
8 GB
16 GB
Chapter 5. Removing and replacing components
Total memory
32 GB
32 GB
32 GB
64 GB
64 GB
128 GB
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