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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 RDIMM DDR5 with the same capacity and width.
● Mixing different DIMM capacities is not supported.
● Mixing module types within a memory channel is not supported. All DIMMs populated must be RDIMM.
● 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.
○ A minimum of 1 DIMM must be populated for each installed CPU.
○ In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
Table 95. Memory population rules
Processor
Single processor Optimizer (Independent channel)
● Populate the sockets with white release tabs.
● 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 configurations result in a performance loss and the 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 four equal memory modules per processor. AMD recommends limiting
processors in that system to 32 cores or less.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in
3.
Remove the air
shroud.
NOTE:
The memory modules are hot to touch for some time after the system has been powered down. Allow the memory
modules to cool before handling them. Handle the memory modules by the card edges and avoid touching the components
or metallic contacts on the memory module.
Steps
1. Locate the appropriate memory module socket.
CAUTION:
Handle each memory module only by the card edges, ensuring not to touch the middle of the
memory module or metallic contacts.
2. To release the memory module from the socket, simultaneously press the ejectors on both ends of the memory module
socket.
3. Lift the memory module away from the system.
146
Installing and removing system components
Configuration
population order
Safety
Before working inside your
Memory population
A{1}, A{2}, A{3}, A{4}, A{5}, A{6}, A{7}, A{8},
A{9}, A{10}, A{11}, A{12}
instructions.
system.
Memory
population
information
Odd amount of
DIMMs per
processor
allowed.
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