– For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 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.
For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and so on.
•
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.
•
Populate six identical memory modules per processor (one DIMM per channel) at a time to maximize performance.
•
To ensure proper system cooling, memory module blanks must be installed in memory sockets that are not occupied.
DIMM population update for Performance Optimized mode with quantity of 4 and 8 DIMMs per processor.
•
When the DIMM quantity is 4 per processor, the population is slot 1, 2, 4, 5.
•
When the DIMM quantity is 8 per processor, the population is slot 1, 2, 4, 5, 7, 8, 10, 11 (2-2-2 platforms).
NVDIMM-N memory module installation guidelines
The following are the recommended guidelines for installing NVDIMM-N memory modules:
•
Each system supports memory configurations with 1, 2, 4, 6, or 12 NVDIMM-Ns.
•
Supported configurations have dual processors and a minimum of 12x RDIMMs.
•
Maximum of 12 NVDIMM-Ns can be installed in a system.
•
NVDIMM-Ns or RDIMMs must not be mixed with LRDIMMs.
•
DDR4 NVDIMM-Ns must be populated only on the black release tabs on processor 1 and 2.
•
All slots on configurations 3, 6, 9, and 12 can be used, but a maximum of 12 NVDIMM-Ns can be installed in a system.
For more information on the supported NVDIMM-N configurations, see the
NVDIMM-N User Guide
at
Table 36. Supported NVDIMM-N for dual processor configurations
Configuration
Description
Memory population rules
RDIMMs
NVDIMM-N
Configuration 1
12x 16 GB RDIMMs, 1x
NVDIMM-N
Processor1 {A1, 2, 3, 4, 5, 6}
Processor2 {B1, 2, 3, 4, 5, 6}
Processor1 {A7}
Configuration 2
12x 32 GB RDIMMs, 1x
NVDIMM-N
Same for all 12x RDIMM
configurations. See
Configuration 1.
Processor1 {A7}
Configuration 3
23x 32 GB RDIMMs, 1x
NVDIMM-N
Processor1 {A1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11, 12}
Processor2 {B1, 2, 3, 4, 5, 6, 7, 8,
9, 10, 11}
Processor2 {B12}
112
Installing and removing system components
Summary of Contents for PowerEdge T640
Page 23: ...Figure 16 Configuration and layout Dell EMC PowerEdge T640 overview 23 ...
Page 24: ...Figure 17 Electrical overview 24 Dell EMC PowerEdge T640 overview ...
Page 25: ...Figure 18 Memory information Dell EMC PowerEdge T640 overview 25 ...
