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Memory problems

Use this information to solve memory problems.

The amount of system memory that is displayed is less than the amount of installed physical memory​

Complete the following steps until the problem is solved.
  1. Make sure that:
    1. You have installed the correct type of memory (see Installing a DIMM).
    2. Memory mirroring or memory sparing mode does not account for the discrepancy. You can check the memory configuration in the Setup utility (see Using the Setup utility).
  2. If new memory has recently been installed, make sure that no configuration events are reported in the event log. If there are any events, resolve them.
    Note
    DIMMs are verified as authentic Lenovo modules by the UEFI software. If any non-authentic DIMMs are detected, an informational message appears in the system event log and memory performance might be limited. Non-authentic DIMMs are not covered by your Lenovo warranty.
  3. If the compute node was recently installed, moved, or serviced, make sure that the DIMMs are correctly seated in the connectors (see Installing a DIMM).
  4. Make sure that all DIMMs are enabled. The compute node might have automatically disabled a DIMM when it detected a problem, or a DIMM might have been manually disabled (see Using the Setup utility).
  5. Run memory diagnostics (see Lenovo Dynamic System Analysis).
  6. Remove DIMMs until the compute node is showing the correct amount of memory. Install one DIMM at a time until you can determine which DIMM is not working properly. Remove that DIMM and replace it with a good DIMM (see Removing a DIMM and Installing a DIMM).
    Note
    After you install or remove a DIMM, you must change and save the new configuration information by using the Setup utility. When you turn on the compute node, a message indicates that the memory configuration has changed. Start the Setup utility and select Save Settings (see Using the Setup utility for more information) to save changes.
  7. If the problem remains, contact Lenovo Support.