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Memory options

The x240 M5 with E5-2600 v4 processors uses Lenovo TruDDR4 memory operating at speeds up to 2400 MHz.

TruDDR4 Memory uses the highest quality components that are sourced from Tier 1 DRAM suppliers and only

memory that meets the strict requirements of Lenovo is selected. It is compatibility tested and tuned on every

System x server to maximize performance and reliability. TruDDR4 Memory has a unique signature that is

programmed into the DIMM that enables System x servers to verify whether the memory that is installed is

qualified or supported by Lenovo.

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, Lenovo memory

automatically assumes the Lenovo system warranty and Lenovo provides service and support worldwide.

The following table lists the supported memory options.

Table 7. Memory options for the x240 M5

Part

Feature

number

code

Registered DIMMs (RDIMMs)

46W0821

ATC8

46W0825

ATC9

46W0829

ATCA

01KN301

AVP0

46W0833

ATCB

Load-reduced DIMMs (LRDIMMs)

46W0841

ATGG

The server supports up to 12 TruDDR 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, for best performance

install them in sets of four (one for each of the four memory channels).

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 ranks and operating voltage, as shown in the "Maximum quantity" row in the following table.

All DIMMs in all CPU memory channels operate at the same speed, which is determined as the lowest

value of the following factors:

Memory speed that is supported by the specific CPU.

Lowest maximum operating speed for the selected memory configuration that depends on rated

speed, as shown in the "Maximum operating speed" section in the following table.

The following table shows the maximum memory speeds that are achievable based on the installed DIMMs and

the number of DIMMs per channel. The table also shows the maximum memory capacity at any speed that is

supported by the DIMM and maximum memory capacity at rated DIMM speed.

Lenovo Flex System x240 M5 (E5-2600 v4)

Description

8GB TruDDR4 Memory (1Rx4, 1.2V) PC4-19200 CL17 2400MHz LP

RDIMM

8GB TruDDR4 Memory (2Rx8, 1.2V) PC4-19200 CL17 2400MHz LP

RDIMM

16GB TruDDR4 Memory (2Rx4, 1.2V) PC4-19200 CL17 2400MHz LP

RDIMM

16GB TruDDR4 Memory (2Rx8, 1.2V) PC4-19200 CL17 2400MHz LP

RDIMM

32GB TruDDR4 Memory (2Rx4, 1.2V) PC4-19200 CL17 2400MHz LP

RDIMM

64GB TruDDR4 Memory (4Rx4, 1.2V) PC4-19200 PC4 2400MHz LP

LRDIMM

Models where

used

All models