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
red
text indicate that the x440 supports higher memory frequencies than the Intel
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
UDIMMs
RDIMMs
LRDIMMs
Ranks
Dual-rank
DIMMs
Single-rank DIMMs
Dual-rank DIMMs
Quad-rank
LRDIMMs
Part numbers
49Y1404
(4 GB)
49Y1406
(4 GB)
49Y1559
(4 GB)
49Y1407 (4 GB)
49Y1397 (8 GB)
49Y1563 (16 GB)
90Y3109 (8 GB)
00D4968 (16
GB)
49Y1567 (16 GB)
90Y3105 (32 GB)
Rated speed
1333 MHz
1333
MHz
1600
MHz
1333 MHz
1600 MHz
1333 MHz
Rated voltage
1.35 V
1.35 V
1.5 V
1.35 V
1.5 V
1.35 V
Max. qty supported*
32
48
48
48
48
48
Max. DIMM capacity
4 GB
4 GB
4 GB
16 GB
16 GB
32 GB
Max. mem. capacity
128 GB
192 GB
192 GB
768 GB
768 GB
1.5 TB
Max memory at
rated speed
128 GB
128 GB
128 GB
512 GB
512 GB
1 TB
Max operating speed (MHz) and operating voltage (operates at rated voltage unless specified)
1 DIMM per channel
1333 MHz
1333
MHz
1600
MHz
1333 MHz
1600 MHz
1333 MHz
2 DIMMs per channel
1333 MHz
1333
MHz
1600
MHz
1333 MHz
1600 MHz
1333 MHz
3 DIMMs per channel
No support
1066
MHz
1066
MHz
1066 MHz
1066 MHz
1066 MHz
* 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)
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