Memory channels are organized as follows:
Processor 1
channel 0: memory sockets A1 and A3
channel 1: memory sockets A2 and A4
The following table shows the memory populations and operating frequencies for the supported
configurations:
Table 20. Memory populations and operating frequencies for the supported configurations
Memory module type
Memory modules
populated per
channel
Operating frequency
(in MT/s)
Maximum memory module
ranks per channel
1.2 V
ECC (UDIMM)
1
2133
Dual rank or single rank
2
2133
Dual rank or single rank
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:
• x4 and x8 DRAM-based memory modules can be mixed. For more information, see the Mode-specific
guidelines section.
• Up to two dual- or single-rank UDIMMs can be populated per channel.
• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A4
are available.
• If memory modules with different speeds are installed, they operate at the speed of the slowest
installed memory module(s) or slower depending on system DIMM configuration.
• When mixing memory modules with different capacities, populate the sockets with memory modules
with the highest capacity first. For example, to mix 4 GB and 8 GB DIMMs, populate 8 GB DIMMs in
the sockets with white release levers and 4 GB DIMMs in the sockets with black release levers.
• 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).
Sample memory configurations
The following table shows sample memory configurations for a single processor configuration.
NOTE: 1R and 2R in the following table indicate single and dual-rank memory modules respectively.
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