DIMM Population Rules
■
You have purchased new DIMMs and you want to use them to upgrade the server's memory.
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
■
“Populating DIMMs for Optimal System Performance” on page 123
■
“Using the Server Fault Remind Button” on page 127
■
“Identify and Remove a DIMM” on page 128
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“Install a DIMM” on page 130
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-
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-
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
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
slot 1). Populate the black slot first, and then populate the white slot.
Note - The black slot for each channel must be populated first because it is considered
furthest away from the processor.
■
The server supports either one DIMM per channel (1DPC) or two DIMMs per channel
(2DPC).
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The server operates properly with a minimum of one DIMM installed per processor.
■
The server does not support lockstep memory mode, which is also known as double device
data correction, or Extended ECC.
■
Mixing of single-rank and dual-rank DIMMs in Oracle Server X8-2L is not supported.
122 Oracle Server X8-2L Service Manual • January 2021
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