Lenovo System x3550 M5 Product Manual page 13

TruDDR4 Memory will have a unique signature programmed into the DIMM, which will enable System x
servers to verify whether the memory installed is qualified/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 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, and there are three DIMMs per
channel.
The following rules apply when selecting the memory configuration:
The server supports RDIMMs and LRDIMMs.
Mixing different 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 speeds:
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" in Table 5.
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs)
Chipkill works only in independent channel mode (the default operational mode) and supports only x4-based
memory DIMMs.
The following table shows the characteristics of the supported DIMMs. Table cells highlighted with a gray
background indicate when the number of DIMMs per channel still allows the DIMMs to operate at a rated
speed.
Table 5. Maximum memory speeds and capacities
DIMM specification
Rank
Part numbers
Rated speed
Rated voltage
Maximum quantity supported**
Maximum DIMM capacity
Maximum memory capacity
Maximum memory at rated speed
Maximum operating speed
1 DIMM per channel
2 DIMMs per channel
3 DIMMs per channel
** The maximum quantity that is supported is shown for two processors installed.
Lenovo System x3550 M5 (E5-2600 v3)
RDIMM
Single rank
46W0784 (4 GB) 46W0792 (8 GB)
46W0788 (8 GB)
2133 MHz 2133 MHz
1.2 V 1.2 V
24
8 GB 8 GB
192 GB 192 GB
128 GB 128 GB
2133 MHz 2133 MHz
2133 MHz 2133 MHz
1600 MHz 1600 MHz
Dual rank
46W0796 (16 GB)
95Y4808 (32 GB)
2133 MHz
1.2 V
24 24
32 GB
768 GB
512 GB
2133 MHz
2133 MHz
1866 MHz
LRDIMM
Quad rank
46W0800 (32 GB)
95Y4812 (64 GB)
2133 MHz
1.2 V
24
64 GB
1.5 TB
1 TB
2133 MHz
2133 MHz
1866 MHz
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