Install a memory module

Use this information to install a memory module.

Before you install a memory module, complete the following steps:
  1. Read Installation Guidelines to ensure that you work safely.

  2. If you are installing DCPMMs for the first time, follow the instructions in DC Persistent Memory Module (DCPMM) setup.

The compute node has a total of 24 dual inline DIMM connectors. The compute node supports low-profile (LP) DDR4 DIMMs with error-correcting code (ECC).

The following illustration shows the system-board components, including memory module connectors.

Figure 1. Memory module and processor location
Memory module location
Table 1. Memory module and processor location
1 Memory module connectors 13–18 4 Processor socket 1
2 Processor socket 2 5 Memory module connectors 7–12
3 Memory module connectors 1–6 6 Memory module connectors 19–24

To install a memory module, complete the following steps:

Watch the procedure. A video of the installation process is available:
Attention: Memory modules are sensitive to static discharge and require special handling. In addition to the standard guidelines for Handling static-sensitive devices:
Note: Remove or install memory modules for one processor at a time.

  1. Locate the memory module connectors. Determine which memory module connector you want to install the memory module.
  2. Touch the static-protective package that contains the memory module to any unpainted metal surface on the Lenovo Flex System chassis or any unpainted metal surface on any other grounded rack component in the rack in which you are installing the memory module for at least 2 seconds; then, remove the memory module from its package.
  3. Make sure that both retaining clips on the memory module connector are in the open position.
    Attention:
    • memory modules are static-sensitive devices. The package must be grounded before it is opened.
    • To avoid breaking the retaining clips or damaging the memory module connector, handle the clips gently.
    Figure 2. Opening retaining clip
    Opening retaining clip
    Note:
    • If necessary, due to space constraints, you can use a pointed tool to open the retaining clips. Place the tip of the tool in the recess on the top of the retaining clip; then, carefully rotate the retaining clip away from the memory module connector.
    • The retaining clips for adjacent memory module connectors of processor one and processor two can not be open at the same time. Remove or install the memory modules for each processor one at a time.
  4. Turn the memory module so that the memory module keys align correctly with the memory module connector on the system board, and gently place the memory module on the connector with both hands.
  5. Firmly press both ends of the memory module straight down into the memory module connector until the retaining clips snap into the locked position.
    Figure 3. Memory module installation
    Memory module installation
  6. Make sure that the small tabs on the retaining clips engage the notches on the memory module. If there is a gap between the memory module and the retaining clips, the memory module has not been correctly installed. Press the memory module firmly into the connector, and then press the retaining clips toward the memory module until the tabs are fully seated.
    Note: Retaining clips on the memory module connectors must be in the closed position to install the air baffle.
After you install the memory module, complete the following steps:
  1. Install the air baffle (see Install the air baffle).

    Attention: To maintain proper system cooling, do not operate the compute node without an air baffle installed over the memory module connectors.
  2. Install the compute node cover (see Install the compute node cover ).

  3. Install the compute node into the chassis (see Install the compute node in the chassis ).

  4. Power on the compute node.