General Memory Module Installation Guidelines; Sample Memory Configurations - Dell Precision Rack 7910 Owner's Manual
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The following table shows the memory populations and operating frequencies for the supported
configurations.
DIMM Type
DIMMs Populated/
Channel
RDIMM
1
2
3
LRDIMM
1
2
3
General memory module installation guidelines
This 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:
•
RDIMMs and LRDIMMs must not be mixed.
•
x4 and x8 DRAM based DIMMs can be mixed.
•
Up to three dual- or single-rank RDIMMs can be populated per channel.
•
Up to three LRDIMMs can be populated per channel regardless of rank count.
•
Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to
A12 are available. For dual-processor systems, sockets A1 to A12 and sockets B1 to B12 are available.
•
Populate all sockets with white release tabs first, then black, and then green.
•
Populate the sockets by highest rank count in the following order — first in sockets with white release
levers, then black, and then green. For example, if you want to mix single-rank and dual-rank DIMMs,
populate dual-rank DIMMs in the sockets with white release tabs and single-rank DIMMs in the
sockets with black release tabs.
•
When mixing memory modules with different capacities, populate the sockets with memory modules
with highest capacity first. For example, if you want to mix 4 GB and 8 GB DIMMs, populate 8 GB
DIMMs in the sockets with white release tabs and 4 GB DIMMs in the sockets with black release tabs.
•
In a dual-processor configuration, the memory configuration for each processor should be identical.
For example, if you populate socket A1 for processor 1, then populate socket B1 for processor 2, and
so on.
•
Memory modules of different capacities can be mixed provided other memory population rules are
followed (for example, 4 GB and 8 GB memory modules can be mixed).
•
Mixing of more than two DIMM capacities in a system is not supported.
•
Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.
Sample memory configurations
The following tables show sample memory configurations for one and two processor configurations that
follow the appropriate memory guidelines.
26
Operating Frequency (in
MT/s)
1.2 V
2133, 1866, 1600, 1333
2133, 1866, 1600, 1333
1866, 1600, 1333
2133, 1866, 1600, 1333
2133, 1866, 1600, 1333
1866, 1600, 1333
Maximum DIMM Rank/Channel
Dual rank or single rank
Dual rank or single rank
Dual rank or single rank
Quad rank
Quad rank
Quad rank
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