Lenovo Flex System x240 Instruction Manual page 15

Table 8. Maximum memory speeds (Part 2 - Single-rank and dual-rank RDIMMs)
Specification
Rank
Part numbers
Rated speed
Rated voltage
Operating voltage
Max quantity†
Largest DIMM
Max memory
capacity
Max memory at
rated speed
Maximum operating speed (MHz)
One DIMM per 1333 MHz
channel
Two DIMMs per 1333 MHz
channel
Three DIMMs per 1066 MHz
channel
† The maximum quantity that is supported is shown for two processors installed. When one processor is installed,
the maximum quantity that is supported is half of that shown.
* 00D5044 (8 GB) operates at 1066 MHz at three DIMMs per channel; 46W0672 (16 GB) operates at 1333 MHz at
three DIMMs per channel
** 00D5028 (4 GB) and 00D5040 (8 GB) operate at 1066 MHz at three DIMMs per channel; 00D5048 (16 GB)
operates at 1333 MHz at three DIMMs per channel
The following memory protection technologies are supported:
ECC

Chipkill (for x4-based memory DIMMs -- look for "x4" in the DIMM description)

Memory mirroring

Memory sparing

If memory mirroring is used, then DIMMs must be installed in pairs (minimum of one pair per CPU), and
both DIMMs in a pair must be identical in type and size.
If memory rank sparing is used, then a minimum of one quad-rank DIMM or two single-rank or dual-rank
DIMMs must be installed per populated channel (the DIMMs do not need being 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.
Flex System x240 Compute Node (E5-2600 v2)
Single rank
00D5024 (4 GB)
00D5036 (8 GB)
1600 MHz
1.35 V
1.35 V 1.5 V
24 24
8 GB 8 GB
192 GB 192 GB
None 128 GB
1600 MHz
1600 MHz
1066 MHz
RDIMMs
Dual rank
00D5044 (8 GB)
46W0672 (16 GB)
1600 MHz
1.35 V
1.35 V 1.5 V
24 24
16 GB 16 GB
384 GB 384 GB
None 256 GB
1333 MHz 1600 MHz
1333 MHz 1600 MHz
1066 MHz 1333 MHz /
1066 MHz*
00D5028 (4 GB)
00D5040 (8 GB)
00D5048 (16 GB)
1866 MHz
1.5 V
1.5 V
24
16 GB
384 GB
256 GB
1866 MHz
1866 MHz
1333 MHz /
1066 MHz**
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