Lenovo Flex System x440 Product Manual page 11

The maximum quantity of DIMMs that can be installed in the server depends on the number of processors
installed. The following table shows the maximum when all four processors are installed. When two
processors are installed, the maximum quantity supported is a half of the quantity that is shown.
All DIMMs in the server operate at the same speed, which is determined as the lowest value of:
The memory speed that is supported by the specific processor.
The lowest of maximum operating speeds for the selected memory configuration that depends on
rated speed, operating voltage, and quantity of DIMMs per channel, as shown under "Max. operating
speed" section in the 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 supported by the
DIMM and the maximum memory capacity at the rated DIMM speed.
In the table:
The entries highlighted in
processor specification. In some instances, this configuration also results larger memory capacity that the
specification recommends.
Cells highlighted with a grey background indicate when the specific combination of DIMM voltage and
number of DIMMs per channel still allows the DIMMs to operate at the rated speed.
Table 5. Maximum memory speeds
DIMM specification
Ranks
Part numbers
Rated speed
Rated voltage
Max. qty supported*
Max. DIMM capacity
Max. mem. capacity
Max memory at
rated speed
Max operating speed (MHz) and operating voltage (operates at rated voltage unless specified)
1 DIMM per channel
2 DIMMs per channel
3 DIMMs per channel
* The maximum quantity supported is shown for four processors installed. When two processors are installed, the
maximum quantity supported is a half of the quantity that is shown. When one processor is installed, the quantity is
one quarter of that shown.
The following memory protection technologies are supported:
ECC
Flex System x440 Compute Node (7917)
red text indicate that the x440 supports higher memory frequencies than the Intel
UDIMMs
Dual-rank Single-rank DIMMs
DIMMs
49Y1404 49Y1406
(4 GB) (4 GB)
1333 MHz 1333
MHz
1.35 V 1.35 V
32 48
4 GB 4 GB
128 GB 192 GB
128 GB 128 GB
1333 MHz 1333
MHz
1333 MHz 1333
MHz
No support 1066
MHz
RDIMMs
Dual-rank DIMMs
49Y1559 49Y1407 (4 GB)
(4 GB) 49Y1397 (8 GB)
49Y1563 (16 GB)
1600 1333 MHz
MHz
1.5 V 1.35 V
48 48
4 GB 16 GB
192 GB 768 GB
128 GB 512 GB
1600 1333 MHz
MHz
1600 1333 MHz
MHz
1066 1066 MHz
MHz
LRDIMMs
Quad-rank
LRDIMMs
90Y3109 (8 GB) 49Y1567 (16 GB)
00D4968 (16 90Y3105 (32 GB)
GB)
1600 MHz 1333 MHz
1.5 V 1.35 V
48 48
16 GB 32 GB
768 GB 1.5 TB
512 GB 1 TB
1600 MHz 1333 MHz
1600 MHz 1333 MHz
1066 MHz 1066 MHz
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