The population rules for adding DIMMs to the server are as follows:
The server supports 64-GB quad-rank (QR) Load-Reduced DIMMs (LRDIMMs), 32-GB dual-rank (DR) Registered DIMMs (RDIMMs), and 16-GB DR/SR RDIMMs.
Mixing 32-GB dual-rank DR 2Rx4 RDIMMs and 16-GB single-rank 1Rx4 SR RDIMMs in a server where the system is configured with a mix of both on every channel is supported.
Randomly mixing 32-GB dual-rank DR RDIMMs and 16-GB single-rank SR RDIMMs on channels can result in very low memory performance and is not supported.
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.
The server supports either one DIMM per channel (1DPC) or two DIMMs per channel (2DPC).
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.