There are two scenarios in which you are required to populate DIMMs:

• A DIMM fails and needs to be replaced.

  In this scenario, you can use the Fault Remind button to determine the failed DIMM, and then remove the failed DIMM and replace it. To ensure that system performance is maintained, you must replace the failed DIMM with a DIMM of the same size (in gigabytes) and type (quad-rank or dual-rank). In this scenario, do not change the DIMM configuration.

• You purchased new DIMMs and want to use them to upgrade the server memory.

  In this scenario, you must adhere to the DIMM population rules and follow the recommended DIMM population order for optimal system performance.