Dell E28S Series, Owner'S Manual, Page: 96 / 220

This table describe about the memory populations and operating frequencies for the supported
configurations.
Table 37 Supported configurations
DIMM
type DIMMs
populated/
channel Voltage Operating
frequency (in
MT/s)
Maximum DIMM rank/
channel
RDIMM
1
1.2 V 2400, 2133, 1866 Dual rank or single rank
2
General memory module installation guidelines
Note: Memory configurations that fail to observe these guidelines can prevent your system
from booting, stop responding during memory configuration, or operating with reduced
memory.
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:
l
RDIMMs and LRDIMMs must not be mixed.
l
x4 and x8 DRAM based memory modules can be mixed. For more information, see the Mode-
specific guidelines section.
l
Up to three dual- or single-rank RDIMMs can be populated per channel.
l
Up to three LRDIMMs can be populated per channel regardless of rank count.
l
If memory modules with different speeds are installed, they will operate at the speed of the
slowest installed memory module(s) or slower depending on system DIMM configuration.
l
Populate memory module 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.
l
Populate all the sockets with white release tabs first, followed by the black release tabs, and
then the green release tabs.
l
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 memory
modules, populate 8 GB memory modules in the sockets with white release tabs and 4 GB
memory modules in the sockets with black release tabs.
l
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.
l
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).
l
Mixing of more than two memory module capacities in a system is not supported.
l
Populate four memory modules per processor (one DIMM per channel) at a time to maximize
performance.
Mode-specific guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on
the memory mode selected.
Installing and removing system components
96 Dell PowerEdge R430 Owner's Manual