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•
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 DDR4.
•
A maximum of two different ranked DIMMs can be populated in a channel regardless of rank count.
•
If memory modules with different speeds are installed, they will operate at the speed of the slowest installed memory module(s).
•
Populate memory module sockets only if a processor is installed.
○ For single-processor systems, sockets A1 to A4 are available.
○ In Optimizer Mode, the DRAM controllers operate independently in the 64-bit mode and provide optimized memory performance.
Table 7. Memory population rules
Processor
Single processor
•
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.
•
Unbalanced memory configurations will result in a performance loss so always populate memory channels identically with identical
DIMMs for best performance.
•
To ensure proper system cooling, memory module blanks must be installed in memory sockets that are not occupied.
Removing a memory module
Prerequisites
WARNING:
Allow the memory modules to cool after you power off the system.
1. Follow the safety guidelines listed in the
2. Follow the procedure listed in the
3.
Remove the air
shroud.
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.
NOTE:
If you are removing the memory module permanently, install a memory module blank. The procedure to install
a memory module blank is similar to that of the memory module.
Configuration
Optimizer (Independent channel)
population order
Safety
instructions.
Before working inside your
Memory population
1, 2, 3, 4
system.
PowerEdge R240 installing and removing system components
Memory population information
Odd amount of DIMMs per
processor allowed.
57
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