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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 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 59. Memory population rules
Processor
Single processor
● 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.
Removing a memory module
Prerequisites
1. Follow the safety guidelines listed in
2. Follow the procedure listed in
3.
Remove the 2U sled from the 1U
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.
NOTE:
To ensure proper system cooling, memory module blanks must be installed in any memory socket that is not
occupied. Remove memory module blanks only if you intend to install memory modules in those sockets.
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.
84
Installing and removing system components
Memory population
A{1}, A{2}, A{3}, A{4}, A{5}, A{6},
A{7}, A{8}
Safety
instructions.
Before working inside your
sled.
system.
Memory population information
8 DIMMs are supported per system.
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