Table 27. Memory channels
Processor
channel 0
channel 1
channel 2
channel 3
Processor 1
slots A1 and A5
slots A2 and A6
slots A3 and A7
slots A4 and A8
Processor 2
slots B1 and B5
slots B2 and B6
slots B3 and B7
slots B4 and B8
The following table shows the memory populations and operating frequencies for the supported configurations.
Table 28. Memory populations and operating frequencies
DIMM Type
DIMMs Populated/
Channel
Voltage
Operating Frequency (in
MT/s)
Maximum DIMM Rank/
Channel
RDIMM
1
1.2 v
2400, 2133, and 1866
Single rank or dual rank
2
General memory module installation guidelines
Your 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 DIMMs can be mixed. For more information, see the Mode specific guidelines section.
•
Up to two dual- or single-rank RDIMMs can be populated per channel.
•
Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A8 are available. For dual-processor
systems, sockets A1 to A8 and sockets B1 to B8 are available.
•
Populate all sockets with white release levers first, and then all the sockets with black release levers.
•
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 levers and 4 GB DIMMs in
the sockets with black release levers.
•
In a dual-processor configuration, the memory configuration for each processor should be identical through the first eight slots. 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 two DIMMs per processor (one DIMM per channel) at a time to maximize performance.
Related link
Mode-specific guidelines
Four memory channels are allocated to each processor. The allowable configurations depend on the memory mode selected.
NOTE:
You can mix x4 and x8 DRAM based DIMMs to support RAS features. However, all guidelines for specific RAS features
must be followed. x4 DRAM based DIMMs retain Single Device Data Correction (SDDC) in memory optimized (independent
channel) mode. x8 DRAM based DIMMs need Advanced ECC mode to gain SDDC.
Installing and removing system components
63
