Datasheet

IBM Flex System x220 Compute Node 10
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.
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

processors, as shown in the "Max. qty supported" row in the following table.
All DIMMs in all processor memory channels operate at the same speed, which is determined as the

lowest value of:
Memory speed supported by a specific processor.

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 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 maximum memory capacity at any
speed supported by the DIMM and maximum memory capacity at rated DIMM speed. In the table, 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 4. Maximum memory speeds (Part 1: UDIMMs and LRDIMMs)
Spec UDIMMs LRDIMMs
Rank Single rank Dual rank Quad rank
Part numbers 49Y1403 (2 GB) 49Y1404 (4 GB) 90Y3105 (32 GB)
Rated speed 1333 MHz 1333 MHz 1333 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
Max quantity* 12 12 12 12 12 12
Largest DIMM 2 GB 2 GB 4 GB 4 GB 32 GB 32 GB
Max memory
capacity
24 GB 24 GB 48 GB 48 GB 384 GB 384 GB
Max memory
at rated speed
12 GB 12 GB 24 GB 24 GB N/A 192 GB
Maximum operating speed (MHz)
1 DIMM
per channel
1333 MHz 1333 MHz 1333 MHz 1333 MHz 1066 MHz 1333 MHz
2 DIMMs
per channel
1066 MHz 1066 MHz 1066 MHz 1066 MHz 1066 MHz 1066 MHz
* The maximum quantity supported is shown for two processors installed. When one processor is installed, the
maximum quantity supported is half of that shown.