servers to verify whether the installed memory is qualified or supported. 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, System x memory automatically assumes the
system's warranty, and service and support provided worldwide.
The following table lists the available memory options for the x3500 M5 server.
Table 6. Memory options
Part
number
Feature
code
Description
Maximum
supported
Standard
models
where used
RDIMMs - 2133 MHz
46W0784 A5B6
4GB TruDDR4 Memory (1Rx8, 1.2V) PC4-17000 CL15
2133MHz LP RDIMM
24 (12 per CPU) -
46W0788 A5B5
8GB TruDDR4 Memory (1Rx4, 1.2V) PC4-17000 CL15
2133MHz LP RDIMM
24 (12 per CPU) A2x, B2x
46W0792 A5B8
8GB TruDDR4 Memory (2Rx8, 1.2V) PC4-17000 CL15
2133MHz LP RDIMM
24 (12 per CPU) -
46W0796 A5B7
16GB TruDDR4 Memory (2Rx4, 1.2V) PC4-17000 CL15
2133MHz LP RDIMM
24 (12 per CPU) All other
models
95Y4808 A5UJ
32GB TruDDR4 Memory (2Rx4, 1.2V) PC4-17000 CL15
2133MHz LP RDIMM
24 (12 per CPU) -
LRDIMMs - 2133 MHz
46W0800 A5B9
32GB TruDDR4 Memory (4Rx4, 1.2V) PC417000 CL15
2133MHz LP LRDIMM
24 (12 per CPU) -
95Y4812 A5UK
64GB TruDDR4 Memory (4Rx4,1.2V) PC4-17000 CL15
2133MHz LP LRDIMM
24 (12 per CPU) -
The server supports up to 12 DIMMs when one processor is installed and up to 24 DIMMs when two
processors are installed. Each processor has four memory channels; there are three DIMMs per channel.
The following rules apply when the memory configuration is selected:
The server supports RDIMMs and LRDIMMs.
Mixing types of memory (RDIMMs and LRDIMMs) is not supported.
The maximum quantity of DIMMs that can be installed in the server depends on the number of
processors.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of the
following factors:
Memory speed that is supported by the specific processor.
Lowest of maximum operating speeds for selected memory configuration that depends on
quantity of DIMMs per channel, as shown under "Maximum operating speed" section in the
following table.
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs)
Memory mirroring
Memory rank sparing
Lenovo System x3500 M5
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