Product guide

IBM Flex System x240 Compute Node (E5-2600) 10
Memory options
IBM DDR3 memory is compatibility tested and tuned for optimal performance and throughput. IBM
memory specifications are integrated into the light path diagnostics for immediate system performance
feedback and optimum system uptime. From a service and support standpoint, IBM memory
automatically assumes the IBM system warranty, and IBM provides service and support worldwide.
The following table lists memory options available for the x240 server. DIMMs can be installed one at a
time, but for performance reasons, install them in sets of four (one for each of the four memory channels).
Table 5. Memory options for the x240
Part number Feature
code
Description Models
where used
Registered DIMM (RDIMM) modules - 1066 MHz and 1333 MHz
49Y1405 8940 2GB (1x2GB, 1Rx8, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP RDIMM -
49Y1406 8941 4GB (1x4GB, 1Rx4, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP RDIMM H1x, H2x, G2x,
F2x, D2x, A1x
49Y1407 8942 4GB (1x4GB, 2Rx8, 1.35V) PC3L-10600 CL9ECC DDR3 1333MHz LP RDIMM -
49Y1397 8923 8GB (1x8GB, 2Rx4, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP RDIMM HBx
49Y1563 A1QT 16GB (1x16GB, 2Rx4, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP RDIMM -
49Y1400 8939 16GB (1x16GB, 4Rx4, 1.35V) PC3L-8500 CL7 ECC DDR3 1066MHz LP RDIMM -
Registered DIMM (RDIMM) modules - 1600 MHz
49Y1559 A28Z 4GB (1x4GB, 1Rx4, 1.5V) PC3-12800 CL11 ECC DDR3 1600MHz LP RDIMM R2x, Q2x, N2x,
M2x,
M1x, L2x, J1x
90Y3178 A24L 4GB (1x4GB, 2Rx8, 1.5V) PC3-12800 CL11 ECC DDR3 1600MHz LP RDIMM -
90Y3109 A292 8GB (1x8GB, 2Rx4, 1.5V) PC3-12800 CL11 ECC DDR3 1600MHz LP RDIMM -
00D4968 A2U5 16GB (1x16GB, 2Rx4, 1.5V) PC3-12800 CL11 ECC DDR3 1600MHz LP RDIMM -
Unbuffered DIMM (UDIMM) modules
49Y1403 A0QS 2GB (1x2GB, 1Rx8, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP UDIMM -
49Y1404 8648 4GB (1x4GB, 2Rx8, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP UDIMM -
Load-reduced (LRDIMM) modules
49Y1567 A290 16GB (1x16GB, 4Rx4, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP
LRDIMM
-
90Y3105 A291 32GB (1x32GB, 4Rx4, 1.35V) PC3L-10600 CL9 ECC DDR3 1333MHz LP
LRDIMM
-
The x240 supports Low Profile (LP) DDR3 memory RDIMMs, UDIMMs, and LRDIMMs. 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:
Mixing 1.5 V and 1.35 V DIMMs in the same server is supported. In such a case all DIMMs operate at

1.5 V.
Mixing of different types of DIMMs (UDIMM , RDIMM and LRDIMM) in the same server is not

supported.