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#### Memory Configuration Guidelines

Keep the following guidelines in mind when installing, upgrading, or replacing DIMMs:

- The motherboard contains 16 memory slots that support DDR3 DIMMs.

- Three DIMM capacities are supported: 2 GByte, 4 GByte, and 8 GByte.

- The DIMM slots are organized into four branches, with each branch connected to a separate Buffer-on-Board (BOB) ASIC. The four branches are designated BOB0 through BOB3.

- Each BOB ASIC supports two DIMMs through separate DDR3 channels.

- DIMM slots must be populated following a three set organization scheme. This set ordering is shown in the following figure.

  - Populate the slots labeled set 1 first.

  - When set 1 slots are full, populate the slots labeled set 2.

  - When sets 1 and 2 are full, populate the slots labeled set 3.

- A minimum of four DIMMs must be installed in the server.

- All DIMMs in the server must be alike in the following characteristics:

  - DIMM size -- All must be 2 GByte, 4 GByte, or 8 GByte capacity.

  - DRAM type -- All must be either 1 GByte or 2 GByte DRAMs

  - Rank -- All must be dual rank DIMMs.

    Note that currently, all supported DIMMs are dual rank.

  - Architecture -- All must use either x4 or x8 memory organization.

- DIMM slots that do not have a DIMM installed must have DIMM fillers.

Figure 51 DIMM Slot Layout on the Motherboard

Figure Legend

1 Populate these slots first.

2 Populate these slots when the set 1 slots are fully populated.

3 Populate these slots when the set 1 and set 2 slots are fully populated.

##### Related Information

- Locate a Faulty DIMM Using the Remind Button

- Identify Faulty DIMMs Using the `show faulty` Command

- Remove a DIMM

- Install a DIMM

- Verify DIMM Functionality

- Increase System Memory With Additional DIMMs

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