Product guide

IBM Flex System x240 Compute Node (E5-2600) 11
The maximum number of ranks supported per channel is eight.

The maximum quantity of DIMMs that can be installed in the server depends on the number of CPUs,

DIMM rank, and operating voltage, as shown in the "Max. qty supported" row in the following table.
The shaded cells indicate that the DIMM type supports the maximum number of DIMMs (24 for the
x240)
All DIMMs in all CPU memory channels operate at the same speed, which is determined as the

lowest value of:
Memory speed supported by specific CPU

Lowest maximum operating speed for the selected memory configuration that depends on rated

speed, as shown under the "Max. operating speed" section in the following table. The shaded
cells indicate that the speed indicated is the maximum that the DIMM allows.
The following tables (Part 1 and Part 2) shows the maximum memory speeds that are achievable based
on the installed DIMMs and the number of DIMMs per channel. The tables also show maximum memory
capacity at any speed supported by the DIMM and maximum memory capacity at rated DIMM speed. In
the tables, 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 rated speed.
Table 6. Maximum memory speeds (Part 1 - UDIMMs, LRDIMMs and Quad rank RDIMMs)
Specification UDIMMs LRDIMMs RDIMMs
Rank Dual rank Quad rank Quad rank
Part numbers 49Y1404 (4 GB) 49Y1567 (16 GB)
90Y3105 (32 GB)
49Y1400 (16 GB)
Rated speed 1333 MHz 1333 MHz 1066 MHz
Rated voltage 1.35 V 1.35 V 1.35 V
Operating
voltage
1.35 V 1.5 V 1.35 V 1.5 V 1.35 V 1.5 V
Maximum
quantity*
16 16 24 24 8 16
Largest DIMM 4 GB 4 GB 32 GB 32 GB 16 GB 16 GB
Max memory
capacity
64 GB 64 GB 768 GB 768 GB 128 GB 256 GB
Max memory
at rated speed
64 GB 64 GB N/A 512 GB N/A 128 GB
Maximum operating speed (MHz)
1 DIMM per
channel
1333 MHz 1333 MHz 1066 MHz 1333 MHz 800 MHz 1066 MHz
2 DIMMs per
channel
1333 MHz 1333 MHz 1066 MHz 1333 MHz NS** 800 MHz
3 DIMMs per
channel
NS† NS† 1066 MHz 1066 MHz NS‡ NS‡
* The maximum quantity supported is shown for two processors installed. When one processor is installed, the
maximum quantity supported is half of that shown.
** NS = Not supported at 1.35 V. Will operate at 1.5 V instead
† NS = Not supported. UDIMMs only support up to 2 DIMMs per channel.
‡ NS = Not supported. RDIMMs support up to 8 ranks per channel.