Lenovo E5-2400 Product Manual - Page 12

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All DIMMs in all processor memory channels operate at the same speed, which is determined as the
lowest value of:
The memory speed supported by the specific processor.
The lowest of maximum operating speeds for the selected memory configuration that
depends on the rated speed, operating voltage, and quantity of DIMMs per channel, as
shown under the "Maximum operating speed" section in Table 5.
The following memory protection technologies are supported:
ECC
Chipkill (for x4-based memory DIMMs)
Memory mirroring
Memory rank sparing
Chipkill works only in independent channel mode (the default is operational mode) and supports only x4-
based memory DIMMs.
If memory mirroring is used, then DIMMs must be installed in pairs (a minimum of one pair per each
processor, and a maximum of two pairs per processor), and both DIMMs in a pair must be identical in type
and size.
If memory rank sparing is used, then two single-rank or dual-rank DIMMs must be installed per populated
channel (the DIMMs do not need to be identical). In rank sparing mode, one rank of a DIMM in each
populated channel is reserved as spare memory. The size of a rank varies depending on the DIMMs
installed.
Chipkill, memory mirroring, and memory rank sparing modes are mutually exclusive. Only one operational
memory mode can be enabled on a server, and it is a system-wide setting.
The following table shows the characteristics of the supported DIMMs. Table cells highlighted with a gray
background indicate when the combination of DIMM voltage and the number of DIMMs per channel still
allows the DIMMs to operate at a rated speed.
Table 5. Maximum memory speeds (Part 1: RDIMMs)
DIMM type
Specification
Rank
Rated speed
Rated voltage
Operating voltage
Max quantity*
Largest DIMM
Max memory capacity
Max memory at rated speed
Maximum operating speed (MHz)
1 DIMM per channel
2 DIMMs per channel
* Maximum quantity supported is shown for two processors installed. When one processor is installed, the maximum quantity
supported is a half of what is shown.
** Rated speed is not supported. Memory DIMMs always operate at speeds lower than rated.
System x3630 M4 (E5-2400)
RDIMM
Single rank
1333 MHz
1600
MHz
1.35 V
1.5 V
1.35 V
1.5 V
1.5 V
12
12
12
4 GB
4 GB
4 GB
48 GB
48 GB
48 GB
48 GB
48 GB
48 GB
1333
1333
1600
MHz
MHz
MHz
1333
1333
1600
MHz
MHz
MHz
Dual rank
1333 MHz
1600
MHz
1.35 V
1.5 V
1.35 V
1.5 V
1.5 V
12
12
12
16 GB
16 GB
8 GB
192 GB
192 GB
96 GB
192 GB
192 GB
96 GB
1333
1333
1600
MHz
MHz
MHz
1333
1333
1600
MHz
MHz
MHz
Quad
rank
1066
MHz
1.35 V
1.35 V
12
8 GB
96 GB
NS**
800 MHz
800 MHz
12