•
x4 and x8 DRAM based memory modules cannot be mixed.
•
Up to two RDIMMs can be populated per channel regardless of rank count.
•
Up to two LRDIMMs can be populated per channel regardless of rank count.
•
If the memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s) or
slower depending on the system DIMM configuration.
•
Populate the memory module sockets only if a processor is installed. For single-processor systems, sockets A1 to A16 are available.
NOTE:
x4 and x8 DRAM based memory modules cannot be mixed. For more information, see the Mode-specific guidelines
section.
•
Populate all the sockets with white release tabs first, followed by the black release tabs.
•
When mixing memory modules with different capacities, populate the sockets with memory modules with the highest capacity first. For
example, if you want to mix 8 GB and 16 GB memory modules, populate 16 GB memory modules in the sockets with white release tabs
and 8 GB memory modules in the sockets with black release tabs.
•
Memory modules of different capacities can be mixed provided other memory population rules are followed (for example, 8 GB and 16
GB memory modules can be mixed).
•
Mixing of more than two memory module capacities in a system is not supported.
•
Populate eight memory modules per processor (one DIMM per channel) at a time to maximize performance.
•
For optimal performance, populate one DIMM per channel with DDR4-2666 memory modules on the first slot of each memory channel.
The first slot of each channel can be identified as the DIMM slots with white latches. For example, 64 GB system memory capacity can
be divided into 8 x 8 GB DIMM slots.
Mode-specific guidelines
Eight memory channels are allocated to the processor. The configurations allowed depends on the memory mode selected.
Memory optimized (independent channel) mode
This mode supports Single Device Data Correction (SDDC) only for memory modules that use x4 device width. It does not impose any
specific slot population requirements.
Removing a memory module
Prerequisites
1
Follow the safety guidelines listed in
2
Follow the procedure listed in
Before working inside your system
.
3
Remove the air shroud. For more information, see
.
WARNING:
Allow the memory modules to cool after you power off the system. Handle the memory modules by the card edges
and avoid touching the components or metallic contacts on the memory module.
CAUTION:
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.
CAUTION:
Handle each memory module only by the card edges, ensuring not to touch the middle of the memory module or
metallic contacts.
2
Push the ejectors outward on both ends of the memory module socket to release the memory module from the socket.
3
Lift and remove the memory module from the system.
Installing and removing system components
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