Dimm Population Rules - Oracle X8-2L Service Manual

DIMM Population Rules

You have purchased new DIMMs and you want to use them to upgrade the server's memory.
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In this scenario, you should adhere to DIMM population rules and follow the recommended
DIMM population order for optimal system performance.
Related information
"DIMM Population Rules" on page 122
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"Populating DIMMs for Optimal System Performance" on page 123
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"Using the Server Fault Remind Button" on page 127
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"Identify and Remove a DIMM" on page 128
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"Install a DIMM" on page 130
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DIMM Population Rules
The population rules for adding DIMMs to the server are as follows:
The server supports 64-GB quad-rank (QR) Load-Reduced DIMMs (LRDIMMs) and 32-
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GB dual-rank (DR) and 16-GB DR Registered DIMMs (RDIMMs).
Do not mix DIMM types in the server. For example, do not mix 64-GB LRDIMMs and 16-
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GB or 32-GB RDIMMs in the same server. If the server has 64-GB LRDIMMs installed,
you cannot install 16-GB or 32-GB RDIMMs and vice versa.
If you are installing a mix of RDIMM sizes (for example, 16-GB and 32-GB), install the
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larger size RDIMMs first, then the smaller RDIMMs, until all of the RDIMMs are installed.
Each memory channel is composed of a black slot (channel slot 0) and a white slot (channel
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slot 1). Populate the black slot first, and then populate the white slot.
Note -
furthest away from the processor.
The server supports either one DIMM per channel (1DPC) or two DIMMs per channel
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(2DPC).
The server operates properly with a minimum of one DIMM installed per processor.
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The server does not support lockstep memory mode, which is also known as double device
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data correction, or Extended ECC.
Mixing of single-rank and dual-rank DIMMs in Oracle Server X8-2L is not supported.
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122 Oracle Server X8-2L Service Manual • January 2021
The black slot for each channel must be populated first because it is considered