The population rules for adding DIMMs to the server are as follows:
The server supports 32-GB quad-rank (QR) Load-Reduced DIMMs (LRDIMMs), and 8-GB single-rank (SR) and 16-GB dual-rank (DR) Registered DIMMs (RDIMMs).
Do not mix 32-GB LRDIMMs and 8-GB or 16-GB RDIMMs in the same server. If the server has 32-GB LRDIMMs installed, you cannot install 8-GB or 16-GB RDIMMs and vice versa.
Within a memory channel, DIMMs must be populated in the black sockets first, then in the black sockets with white tabs, and then in the white sockets.
If you are installing a mix of RDIMM sizes (for example, 8-GB and 16-GB), install the larger size RDIMMs first, then the smaller RDIMMs, until all of the RDIMMs are installed.
There are no restrictions on the minimum number of DIMM sockets that must be populated. The server will operate properly with one DIMM installed.