To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory. If your system's memory configuration fails to observe these guidelines, your system might not boot, stop responding during memory configuration, or operate with reduced memory.
The memory bus may operate at speeds of 5600 MT/s depending on the following factors:
System profile selected (for example, Performance, Performance Per Watt Optimized (OS), or Custom [can be run at high speed or lower])
Maximum supported DIMM speed of the processors
Maximum supported speed of the DIMMs
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
The following are the recommended guidelines for installing memory modules:
All DIMMs must be DDR5.
If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
Populate memory module sockets only if a processor is installed.
In
Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory performance.
Table 1. Memory population rulesThe below table describes the memory population information.
Processor
Memory population
Memory population information
Single processor
A{1}, A{2}, A{3}, A{4}, A{5}, A{6}, A{7}, A{8}
8 DIMMs are supported per system.
Not more than two DIMM part numbers allowed in the system.
x4 and x8 DRAM based memory modules can be mixed.
For best performance, populate all memory channels equally (8DIMMs per CPU) using identical DIMMs.
Supported total number of RDIMMs in system: 2DIMMs, 4DIMMs, 6DIMMs, 8DIMMs.
3 DIMMs, 5 DIMMs, 7DIMMs configurations are not supported.
Population order requires the largest capacity DIMM be placed first. For example, if we are populating with 32GB and 64GB RDIMMs, we would populate 64GB RDIMMs first.
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