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NOTE:
1R and 2R in the following table indicate single and dual-rank memory modules respectively.
Table 5. Memory configurations
Populated system
capacity (in GB)
8
16
32
64
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 configurations fail 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 frequency can be 2666 MT/s, 2400 MT/s, or 2133 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 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 6. 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.
NOTE:
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.
NOTE:
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.
Memory module size
(in GB)
8
8
16
16
8
16
Configuration
Optimizer (Independent
channel) population order
Number of memory
modules
1
2
1
2
4
4
Memory population
1, 2, 3, 4
Installing and removing system components
Memory module rank,
organization, and
frequency
1R, x8, 2666 MT/s
1R, x8, 2666 MT/s
2R, x8, 2666 MT/s
2R, x8, 2666 MT/s
1R, x8, 2666 MT/s
2R, x8, 2666 MT/s
Memory population
information
Odd amount of DIMMs per
processor allowed.
Memory module slot
population
A1
A1, A2
A1
A1, A2
A1, A2, A3, A4
A1, A2, A3, A4
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