Memory Options - IBM Flex System x240 M5 Product Manual

Memory options

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. TruDDR4 Memory has a unique
signature that is programmed into the DIMM that enables IBM System x servers to verify whether the
memory that is installed is qualified or supported by IBM. Because 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 following table lists the supported memory options.
Table 5. Memory options for the x240 M5
Part Feature Description
number code
Registered DIMMs (RDIMMs)
46W0784 A5B6 4GB TruDDR4 Memory (1Rx8, 1.2V) PC4-17000 CL15 2133MHz LP RDIMM
46W0788 A5B5 8GB TruDDR4 Memory (1Rx4, 1.2V) PC4-17000 CL15 2133MHz LP RDIMM
46W0792 A5B8 8GB TruDDR4 Memory (2Rx8, 1.2V) PC4-17000 CL15 2133MHz LP RDIMM
95Y4821 ASD9 16GB TruDDR4 Memory (2Rx4, 1.2V) PC4-17000 CL15 2133MHz LP RDIMM
Load-reduced DIMMs (LRDIMMs)
46W0800 A5B9 32GB TruDDR4 Memory (4Rx4, 1.2V) PC417000 CL15 2133MHz LP LRDIMM -
95Y4812 A5UK 64GB TruDDR4 Memory (4Rx4,1.2V) PC4-17000 CL15 2133MHz LP LRDIMM -
The server supports up to 12 TruDDR Memory DIMMs when one processor is installed and up to 24
DIMMs when two processors are installed. Each processor has four memory channels, and there are
three DIMMs per memory channel (3 DPC). RDIMMs and LRDIMMs are supported, but the mixing of
these different types is not supported. UDIMMs are not supported. DIMMs can be installed individually;
however, install them in sets of four (one for each of the four memory channels) for performance reasons.
The following rules apply when the memory configuration is selected:
Mixing of different types of DIMMs (RDIMM and LRDIMM) in the same server is not supported.

The maximum number of supported ranks per channel is eight.

The maximum quantity of DIMMs that can be installed in the server depends on the number of CPUs,

DIMM rank and operating voltage, as shown in the "Maximum quantity" row in the following table. The
shaded cells indicate that the DIMM type supports the maximum number of DIMMs (24 for the x240
M5).
IBM Flex System x240 M5 Product Guide
Models
where used
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All models
12