Mirroring
Lockstep Mode
Configuration Guidelines
Memory can be configured to meet various needs and workloads subject to the following general rules:
Mixing memory type (RDIMM, LRDIMM) is not supported.
DIMM capacities and rank can be mixed.
When you are populating for the various RAS modes the following rules apply:
If memory mirroring or lockstep is used, DIMMs must be installed in pairs (minimum of one pair per
each CPU), and both DIMMs in a pair must be identical in type, size, and rank.
If memory sparing is used, one rank of a DIMM in each populated channel is reserved as spare
memory; therefore, Single Rank DIMMs cannot be used. DIMMs in a pair must be identical in type,
size, and rank.
Memory Optimization
The memory subsystem can be optimized for various factors, including performance, capacity, or power
consumption. Refer to the following guidelines when you are selecting memory options:
Guidelines for maximum memory performance:
Use all available memory channels (four per processor, eight total per system).
Use identical DIMM populations in size and speed across channels.
Populate both processors with equal amounts of memory.
Use the same number of ranks that are populated per channel.
Have at least two ranks available on each channel.
Guidelines for lowest memory energy consumption
Use fewer, higher capacity DIMMs. For example, a configuration of 8x 16 GB DIMMs often
has lower power requirements than a configuration of 16x 8 GB DIMMs, despite the same
capacity.
Populating more DIMMs per channel—but using fewer channels (the opposite of the
preceding bullet)—further reduces overall system energy use, but at the cost of significant
performance reduction.
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General
Weight and Dimensions
