Dell PowerEdge XE2420 EMC Installation and Service Manual - Page 102

General memory module installation guidelines, DIMM type, Capacity, DIMM rated voltage

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Table 38. Supported memory matrix DIMM type Rank type Capacity RDIMM LRDIMM 1R 2R 4R, 8R 8 GB 16 GB, 32 GB, 64 GB 64 GB, 128 GB DIMM rated voltage and maximum speed DDR4 (1.2V), 2666 MT/s DDR4 (1.2V), 2933 MT/s DDR4 (1.2V), 2666 MT/s Operating Speed 1 DIMMs per Channel (DPC) 2666 MT/s 2933 MT/s 2666 MT/s 2 DIMMs per Channel (DPC) 2666 MT/s 2933 MT/s 2666 MT/s 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 2933 MT/s, 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 speed of the DIMMs NOTE: MT/s indicates DIMM speed in Mega-Transfers 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: Table 39. DIMM type mix table DIMM type RDIMM RDIMM allowed LRDIMM Not allowed 3DS/TSV LRDIMM Not allowed LRDIMM Not allowed Allowed Not allowed 3DS/TSV LRDIMM Not allowed Not allowed allowed ● All DIMMs must be DDR4. ● 64 GB LRDIMMs that are DDP (Dual Die Package) LRDIMMs must not be mixed with 128 GB LRDIMMs that are TSV (Through Silicon Via/3DS) LRDIMMs. ● x4 and x8 DRAM-based memory modules can 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. ● 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 operate at the speed of the slowest installed memory modules. ● Populate memory module sockets only if a processor is installed. ○ For single-processor systems, sockets A1 to A10 are available. ○ For dual-processor systems, sockets A1 to A10 and sockets B1 to B6 are available. ● 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. ● In a dual-processor configuration, the memory configuration for each processor must be identical. 102 Installing and removing system components

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Table 38. Supported memory matrix
DIMM type
Rank
type
Capacity
DIMM rated voltage and
maximum speed
Operating Speed
1 DIMMs per
Channel (DPC)
2 DIMMs per
Channel (DPC)
RDIMM
1R
8 GB
DDR4 (1.2V), 2666 MT/s
2666 MT/s
2666 MT/s
2R
16 GB, 32 GB, 64
GB
DDR4 (1.2V), 2933 MT/s
2933 MT/s
2933 MT/s
LRDIMM
4R, 8R
64 GB, 128 GB
DDR4 (1.2V), 2666 MT/s
2666 MT/s
2666 MT/s
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 2933 MT/s, 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 speed of the DIMMs
NOTE:
MT/s indicates DIMM speed in Mega-Transfers 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:
Table 39. DIMM type mix table
DIMM type
RDIMM
LRDIMM
3DS/TSV LRDIMM
RDIMM
allowed
Not allowed
Not allowed
LRDIMM
Not allowed
Allowed
Not allowed
3DS/TSV LRDIMM
Not allowed
Not allowed
allowed
●
All DIMMs must be DDR4.
●
64 GB LRDIMMs that are DDP (Dual Die Package) LRDIMMs must not be mixed with 128 GB LRDIMMs that are TSV
(Through Silicon Via/3DS) LRDIMMs.
●
x4 and x8 DRAM-based memory modules can 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.
●
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 operate at the speed of the slowest installed memory modules.
●
Populate memory module sockets only if a processor is installed.
○
For single-processor systems, sockets A1 to A10 are available.
○
For dual-processor systems, sockets A1 to A10 and sockets B1 to B6 are available.
●
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.
●
In a dual-processor configuration, the memory configuration for each processor must be identical.
102
Installing and removing system components