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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 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 4800 MT/s, 4400 MT/s or 4000 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.
● All DIMMs must be DDR5.
● Memory mixing is not supported for different DIMM capacities.
● 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.
○ For dual-processor systems, sockets A1 to A8 and sockets B1 to B8 are available.
○ A minimum of 1 DIMM must be populated for each installed processor.
● In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory
performance.
Table 104. Memory population rules
Processor
Dual processor (Start with processor1.
Processor 1 and processor 2 population
should match)
● Always populate memory channels identically with equal DIMMs for best performance.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in
3.
Remove the 1U air
shroud.
NOTE:
The procedure to remove the memory module is the same for Rear Accessed and Front Accessed configurations.
WARNING:
The memory modules are hot to touch for some time after the system has been powered off. Allow
the memory modules to cool before handling them.
Steps
1. Locate the appropriate memory module socket.
2. To release the memory module from the socket, simultaneously press the ejectors on both ends of the memory module
socket to fully open.
CAUTION:
Handle each memory module only by the card edges, ensuring not to touch the middle of the
memory module or metallic contacts.
3. Lift the memory module away from the system.
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Installing and removing system components
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}
Safety
instructions.
Before working inside your
system.
Memory population information
2, 4, 8, 12, and 16 DIMMs are supported
per system.
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