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Installing a memory module

The following notes describe the types of DIMMs that the server supports and other information that you must consider when you install DIMMs.

  • When you install or remove DIMMs, the server configuration information changes. When you restart the server, the system displays a message that indicates that the memory configuration has changed.
  • The server supports only industry-standard double-data-rate 3 (DDR3), 800, 1066, 1333, 1600, or 1866 MHz, PC3-6400, PC3-8500, PC3-10600, PC3-12800, or PC3-14900 registered or unbuffered, synchronous dynamic random-access memory (SDRAM) dual inline memory modules (DIMMs) with error correcting code (ECC). See the Lenovo ServerProven website for a list of supported memory modules for the server.

    • The specifications of a DDR3 DIMM are on a label on the DIMM, in the following format.

      gggggeRxff PC3v-wwwwwm-aa-bb-ccd

      where:
      • ggggg is the total capacity of the DIMM (for example, 1GB, 2GB, or 4GB)
      • eR is the number of ranks
        • 1R = single-rank
        • 2R = dual-rank
        • 4R = quad-rank
      • xff is the device organization (bit width)
        • x4 = x4 organization (4 DQ lines per SDRAM)
        • x8 = x8 organization
        • x16 = x16 organization
      • v is the SDRAM and support component supply voltage (VDD)
        • Blank = 1.5 V specified
        • L = 1.35 V specified, 1.5 V operable
          Note
          Values for these voltages are ‘specified’ which means the device characteristics such as timing are supported at this voltage. Values are ‘operable’ which means that the devices can be operated safely at this voltage. However, device characteristics such as timing may not be guaranteed. All devices must be ‘tolerant’ of the highest DDR3 nominal voltage of 1.5 V, meaning that they may not operate at 1.5 V but may be powered at that voltage without damage to the devices.
      • wwwww is the DIMM bandwidth, in MBps
        • 6400 = 6.40 GBps (DDR3-800 SDRAMs, 8-byte primary data bus)
        • 8500 = 8.53 GBps (DDR3-1066 SDRAMs, 8-byte primary data bus)
        • 10600 = 10.66 GBps (DDR3-1333 SDRAMs, 8-byte primary data bus)
        • 12800 = 12.80 GBps (DDR3-1600 SDRAMs, 8-byte primary data bus)
        • 14900 = 14.93 GBps (DDR3-1866 SDRAMs, 8-byte primary data bus)
      • m is the DIMM type
        • E = Unbuffered DIMM (UDIMM) with ECC (x72-bit module data bus)
        • L = Load Reduction DIMM (LRDIMM)
        • R = Registered DIMM (RDIMM)
        • U = Unbuffered DIMM with no ECC (x64-bit primary data bus)
      • aa is the CAS latency, in clocks at maximum operating frequency
      • bb is the JEDEC SPD Revision Encoding and Additions level
      • cc is the reference design file for the design of the DIMM
      • d is the revision number of the reference design of the DIMM
    Note
    To determine the type of a DIMM, see the label on the DIMM. The information on the label is in the format xxxxx nRxxx PC3v-xxxxxx-xx-xx-xxx. The numeral in the sixth numerical position indicates whether the DIMM is single-rank (n=1), dual-rank (n=2), or quad-rank (n=4).
  • The following rules apply to DDR3 RDIMM speed as it relates to the number of RDIMMs in a channel:
    • When you install 1 RDIMM per channel, the memory runs at 1866 MHz
    • When you install 2 RDIMMs per channel, the memory runs at 1600 MHz
    • When you install 3 RDIMMs per channel, the memory runs at 1066 MHz
    • All channels in a server run at the fastest common frequency
    • Do not install registered, unbuffered, and load reduction DIMMs in the same server
  • The maximum memory speed is determined by the combination of the microprocessor, DIMM speed, DIMM type, Operating Modes in UEFI settings, and the number of DIMMs installed in each channel.
  • In two-DIMM-per-channel configuration, a server with an Intel Xeon™ E5-2600 series microprocessor automatically operates with a maximum memory speed of up to 1600 MHz when the following condition is met:
    • Two 1.35 V single-rank, dual-ranl, or quad-rank UDIMMs, RDIMMs or LRDIMMs are installed in the same channel. In the Setup utility, Memory speed is set to Max performance and LV-DIMM power is set to Enhance performance mode. The 1.35 V UDIMMs, RDIMMs or LRDIMMs will function at 1.5 V.
  • The server supports a maximum of 16 dual-rank UDIMMs. The server supports up to two UDIMMs per channel.
  • The server supports a maximum of 24 single-rank, dual-rank, or 16 quad-rank RDIMMs. The server does not support three quad-rank RDIMMs in the same channel.
  • The following table shows an example of the maximum amount of memory that you can install using ranked DIMMs:
    Table 1. Maximum memory installation using ranked DIMMs
    Number of DIMMsDIMM typeDIMM sizeTotal memory
    16Dual-rank UDIMMs4 GB64 GB
    24Single-rank RDIMMs2 GB48 GB
    24Single-rank RDIMMs4 GB96 GB
    24Dual-rank RDIMMs8 GB192 GB
    24Dual-rank RDIMMs16 GB384 GB
    24HCDIMMs16 GB384 GB
    24HCDIMMs32 GB768 GB
    16Quad-rank RDIMMs8 GB128 GB
    24Quad-rank LRDIMMs32 GB768 GB
  • The UDIMM option that is available for the server is 4 GB. The server supports a minimum of 4 GB and a maximum of 64 GB of system memory using UDIMMs.
  • The RDIMM options that are available for the server are 2 GB, 4 GB, 8 GB, and 16 GB. The server supports a minimum of 2 GB and a maximum of 384 GB of system memory using RDIMMs.
  • The HCDIMM options that are available for the server are 16 GB and 32 GB. The server supports a minimum of 16 GB and a maximum of 768 GB of system memory using HCDIMMs.
    Note
    Do not mix the 16 GB HCDIMM and the 32 GB HCDIMM in the server.
  • The LRDIMM option that is available for the server is 32 GB. The server supports a minimum of 32 GB and a maximum of 768 GB of system memory using LRDIMMs.
    Note
    The amount of usable memory is reduced depending on the system configuration. A certain amount of memory must be reserved for system resources. To view the total amount of installed memory and the amount of configured memory, run the Setup utility. For additional information, see Configuring the server.
  • A minimum of one DIMM must be installed for each microprocessor. For example, you must install a minimum of two DIMMs if the server has two microprocessors installed. However, to improve system performance, install a minimum of four DIMMs for each microprocessor.
  • DIMMs in the server must be the same type (RDIMM, UDIMM, HCDIMM, or LRDIMM) to ensure that the server will operate correctly.
  • When you install one quad-rank DIMM in a channel, install it in the DIMM connector furthest away from the microprocessor.
  • When you install Flash DIMMs, follow the following rules strictly:
    • Flash DIMM thermal specification supports the maximum temperature up to 70°C (158°F).
      Note
      The system may indicates specific error messages when the temperature does not meet 70°C (158°F), these error messages do not impact the system operation.
    • Flash DIMM configuration supports RHEL 6.4 and RHEL 6.5.
    • Flash DIMM configuration is only available to mix with one type of 16GB RDIMM, with quantities of 8 or 16 DIMMs.
    • Flash DIMM configuration does not support the fan redundancy function when the ambient temperature is over 30°C (86°F). Please refer to the retain tip H212833 at the Lenovo Support Portalfor the detailed information.
      Table 2. Supported RDIMM
      DIMM descriptionOption part numberFRU part number
      16 GB dual-rank 1.5 V, DDR3, 1866MHz, PC3-14900 CL 13 ECC LP RDIMM00D504846W0670
    • SSD Flash DIMM is always installed with a RDIMM in the same channel.
    • SSD Flash DIMMs can not be mixed with LRDIMMs and UDIMMs.
    • The Flash DIMM options that are available for the server are 200 GB and 400 GB, with quantities of 4 or 8 DIMMs.
      Note
      Do not mix 200 GB Flash DIMM and 400 GB Flash DIMM in the server.
    • Flash DIMM configuration supports the following microprocessors.
      Table 3. Supported microprocessors
      Microprocessor descriptionOption part numberFRU part number
      Intel Xeon Processor E5-2643 v2, 3.5 GHz, 25 MB, 1866 MHz, 130 W (6-core)46W437100Y2790
      Intel Xeon Processor E5-2667 v2, 3.3 GHz, 25 MB, 1866 MHz, 130 W (8-core)46W437200Y2791
      Intel Xeon Processor E5-2690 v2, 3.0 GHz, 25 MB, 1866 MHz, 130 W (10-core)46W437700Y2787
      Intel Xeon Processor E5-2697 v2, 2.7 GHz, 30 MB, 1866 MHz, 130 W (12-core)46W437400Y2777
  • Flash DIMM configuration supports one mezz adapter.
    Table 4. Supported adapter
    Adpater descriptionOption part numberFRU part number
    Intel x520 dual port 10GbE SFP+ embedded adapter49Y798049Y7982
  • For detailed Flash DIMM installation sequence, go to DIMM installation sequence.
Note
  1. You can install DIMMs for microprocessor 2 as soon as you install microprocessor 2; you do not have to wait until all of the DIMM slots for microprocessor 1 are filled.
  2. DIMM slots 13-24 are reserved for microprocessor 2; thus, DIMM slots 13-24 are enabled when microprocessor 2 is installed.
The following illustration shows the location of the DIMM connectors on the system board.
Figure 1. DIMM connectors location
DIMM connectors location
  • DIMM installation sequence
    Depending on the server model, the server may come with a minimum of one 2 GB or 4 GB DIMM installed in slot 1. When you install additional DIMMs, install them in the order shown in the following table to optimize system performance.
  • Memory mirrored channel
    Memory mirrored channel mode replicates and stores data on two pairs of DIMMs within two channels simultaneously.
  • Memory rank sparing
    The memory rank sparing feature disables the failed memory from the system configuration and activates a rank sparing DIMM to replace the failed active DIMM.
  • Installing a memory module
    Use this information to install a memory module.
  • Replacing a memory module
    Use this information to replace a memory module.