The IBM System x3500 M3 supports DDR3 memory. The server supports up to eight DIMMs when one processor is installed and up to 16 DIMMs when two processors are installed. However, the maximum number of DIMMs is limited by the number of ranks in the DIMMs:

• RDIMMs
  • Up to 16 single-rank RDIMMs for a maximum of 64 GB (16x 4 GB)
  • Up to 16 dual-rank RDIMMs for a maximum of 128 GB (16x 8 GB)
  • Up to 12 quad-rank RDIMMs for a maximum of 192 GB (12x 16 GB)
• UDIMMs
  • Up to 16 single-rank UDIMMs for a maximum of 16 GB (16x 1 GB)
  • Up to 16 dual-rank UDIMMs for a maximum of 64 GB (16x 4 GB)

Each CPU has three memory channels, two of which contain three DIMMs per channel and third contains two DIMMs. RDIMMs can be populated up to three per channel. However, UDIMMs can only be populated two DIMMs per channel. That is, you can have up to 16 RDIMMs installed in the server, but only up to 12 UDIMMs. Mixing UDIMMs and RDIMMs is not supported.

Maximum memory speed is limited by memory speed supported by the specific CPU (that is, if the CPU only supports 1066 MHz, then the memory speed cannot exceed 1066 MHz in any case) and by the number and type of DIMMs installed (whatever is lower), as follows:

• Intel Xeon 5600 series processors:
  • 1333 MHz when one or two single-rank or dual-rank RDIMMs per channel are installed or one UDIMM per channel is installed
  • 1066 MHz when one quad-rank RDIMM per channel is installed or two UDIMMs per channel are installed
  • 800 MHz when three single-rank or dual-rank RDIMMs or two quad-rank RDIMMs per channel are installed
• Quad-core Intel Xeon 5500 series processors:
  • 1333 MHz when one single-rank or dual-rank RDIMM per channel is installed or one UDIMM per channel is installed
  • 1066 MHz when two single-rank or dual-rank RDIMMs per channel are installed, or one quad-rank RDIMM per channel is installed, or two UDIMMs per channel are installed
  • 800 MHz when three single-rank or dual-rank RDIMMs or two quad-rank RDIMMs per channel are installed
• Dual-core Intel Xeon 5500 series processors only support memory speed at 800 MHz.

The server supports both 1.5 V and 1.35 V DIMMs. Mixing 1.5 V and 1.35 V DIMMs in the same server is supported for Intel Xeon 5600 series processor-based systems, in such a case all DIMMs operate at 1.5 V. Intel Xeon 5500 series processor-based systems do not support 1.35 V DIMMs.

The following memory protection technologies are supported:

• ECC
• ChipKill (for x4-based RDIMMs)
• Memory mirroring
• Memory sparing

If memory mirroring is used then DIMMs must be installed in pairs (a minimum of one pair per CPU), and both DIMMs in a pair must be identical in type and size. If memory sparing is used, then DIMMs must be installed in sets of three, and all DIMMs in the same set must be identical in type and size. Memory sparing is only supported for Intel Xeon 5600 series processor-based systems.

The following table lists memory options available for the x3500 M3 server.

Table 5. Memory options

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