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NOTE:
DDR4 memory is not supported.
NOTE:
The processor may reduce the performance of the rated DIMM speed.
General memory module installation guidelines
To ensure optimal performance of your system, observe the following general guidelines when configuring your system memory.
If your system's memory configurations fail to observe these guidelines, your system might not boot, stop responding during
memory configuration, or operate with reduced memory. This section provides information on the memory population rules for
single or dual processor system.
The memory bus operate at speeds up to 4800 MT/s depending on the following factors:
● System profile selected (for example, Performance Optimized, 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 system supports Flexible Memory Configuration, enabling the system to be configured and run in any valid chipset
architectural configuration. The following are the recommended guidelines for installing memory modules:
● All DIMMs must be DDR5.
● Mixing different DIMM capacities is not supported.
● Mixing module types within a memory channel is not supported. All DIMMs populated must be RDIMM.
● If memory modules with different speeds are installed, they operate at the speed of the slowest installed memory module(s).
● Mixing different widths (x4 & x8) is not supported.
● Populate memory module sockets only if a processor is installed.
○ For single-processor systems, sockets A1 to A12 are available.
○ For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.
○ In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
Table 105. Memory population rules
Processor
Dual processor (Start
with processor1. Processor
1 and processor 2
population should match)
● In a dual-processor configuration, the memory configuration for each processor must be identical. For example, if you
populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
● Persistent memory will not be supported on Genoa based platforms.
● For best performance, populate all memory channels equally (12 DIMMs per CPU) using identical DIMMs.
● Unbalanced or odd memory configuration results in a performance loss and system may not identify the memory modules
being installed, so always populate memory channels identically with equal DIMMs for best performance.
● Minimum recommended configuration is to populate 2, 4, 6, 8, 10, 12 equal memory modules per processor. AMD
recommends limiting processors in that system to 32 cores or less.
● Populate twelve equal memory modules per processor (one DIMM per channel) at a time to maximize performance.
NOTE:
Equal memory modules refer to DIMMs with identical electrical specification and capacity that may be from
different vendors.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in the
Configuration
Optimizer (Independent
channel) population order
Safety
instructions.
Before working inside your
Memory population
A{1}, B{1}, A{2}, B{2}, A{3}, B{3},
A{4}, B{4}, A{5}, B{5}, A{6},
B{6}, A{7}, B{7}, A{8}, B{8},
A{9}, B{9}, A{10}, B{10}, A{11},
B{11}, A{12}, B{12}
system.
Installing and removing system components
Memory population
information
1,2,4,6,8,10 and 12 DIMM
per processor allowed.
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