Product guide

IBM NeXtScale nx360 M5 12
Memory options
IBM TruDDR4 Memory uses the highest quality components that are sourced from Tier 1 DRAM suppliers
and only memory that meets the strict requirements of IBM is selected. It is compatibility tested and tuned
on every IBM System x server to maximize performance and reliability. IBM TruDDR4 Memory has a
unique signature that is programmed into the DIMM that enables IBM System x servers to verify whether
the memory installed is qualified/supported by IBM. Because IBM TruDDR4 Memory is authenticated,
certain extended memory performance features can be enabled to extend performance over industry
standards. From a service and support standpoint, IBM memory automatically assumes the IBM system
warranty, and IBM provides service and support worldwide.
The NeXtScale nx360 M5 supports up to eight TruDDR Memory DIMMs when one processor is installed
and up to 16x DIMMs when two processors are installed. Each processor has four memory channels, and
there are two DIMMs per memory channel (2 DPC). RDIMMs and LRDIMMs are supported, but the mixing
of these different types is not supported. UDIMMs are not supported.
The following table lists the memory options that are available for the nx360 M5 server.
Table 5. Memory options
Part
number
Feature
code
Description Maximum
supported
Models
where used
RDIMMs
46W0784 A5B6 4GB TruDDR4 Memory (1Rx8, 1.2V)
PC4-17000 CL15 2133MHz LP RDIMM
16 -
46W0788 A5B5 8GB TruDDR4 Memory (1Rx4, 1.2V)
PC4-17000 CL15 2133MHz LP RDIMM
16 -
46W0792 A5B8 8GB TruDDR4 Memory (2Rx8, 1.2V)
PC4-17000 CL15 2133MHz LP RDIMM
16 22x, 42x
46W0796 A5B7 16GB TruDDR4 Memory (2Rx4, 1.2V)
PC4-17000 CL15 2133MHz LP RDIMM
16 62x
LRDIMMs
46W0800 A5B9 32GB TruDDR4 Memory (4Rx4, 1.2V)
PC417000 CL15 2133MHz LP LRDIMM
16 -
In the nx360 M5, the maximum memory speed of a configuration is the lower of the following two values:
The memory speed of the processor

The memory speed of the DIMM

The following memory protection technologies are supported:
ECC

Chipkill (x4 memory options only: 1Rx4, 2Rx4, and 4Rx4)
