5.4.1.4 DIMM Installation Rules
This section applies to a server fully configured with DDR4 DIMMs. If DCPMMs are used
together, see 5.4.2.4 DIMM Installation Rules.
⚫
Observe the following when configuring DDR4 memory modules:
− Install memory modules only when corresponding processors are installed.
− Do not install LRDIMMs and RDIMMs in the same server.
− Install filler memory modules in vacant slots.
⚫
Observe the following when configuring DDR4 memory modules in specific
operating mode:
− Memory sparing mode
◼ Comply with the general installation guidelines.
◼ Each memory channel must have a valid online spare configuration.
◼ The channels can have different online spare configurations.
◼ Each populated channel must have a spare rank.
− Memory mirroring mode
◼ Comply with the general installation guidelines.
◼ Each processor supports two integrated memory controllers (IMCs). At
least two channels of each IMC are used for installing memory modules
(channels 1 and 2, or channels 1, 2, and 3). The installed memory
modules must be identical in size and organization.
◼ For a multi-processor configuration, each processor must have a valid
memory mirroring configuration.
− Memory scrubbing mode
◼ Comply with the general installation guidelines.
5.4.1.5 Memory Installation Positions
A 5288 V5 supports a maximum of 24 DDR4 DIMMs. To maximize the performance,
balance the total memory capacity between the installed processors and load the
channels similarly whenever possible.
At least one DDR4 DIMM must be installed in the memory slots corresponding to CPU
1.
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