Owners Manual

channel 1: memory sockets D2, D6, and D10
channel 2: memory sockets D3, D7, and D11
channel 3: memory sockets D4, D8, and D12
The following table shows the memory populations and operating frequencies for the supported configurations.
Table 20. Supported configurations
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 and dual rank
2 2400, 2133, and 1866 single and dual rank
3 1866 single and dual rank
LRDIMM 1
1.2 V
2400, 2133, and 1866 quad rank
2 2400, 2133, and 1866
quad rank
3 2133
quad rank
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 best performance:
• LRDIMMs, and RDIMMs must not be mixed.
• x4 and x8 DRAM based DIMMs can be mixed. For more information, see the Mode-specific guidelines section.
• A maximum of three single-rank or dual-rank RDIMMs can be populated in a channel.
• Up to three LRDIMMs can be populated regardless of rank count.
• Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.
• 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.
• Populate DIMMs based on the following processor-heat sink configurations.
• 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, black, and then green.
• Populate the sockets by highest capacity DIMM in the following order - first in sockets with white release levers and then black. For
example, if you want to mix 16 GB and 8 GB DIMMs, populate 16 GB DIMMs in the sockets with white release tabs and 8 GB DIMMs in
the sockets with black release tabs.
• 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.
• Memory modules of different sizes can be mixed provided that other memory population rules are followed (for example, 4 GB and 8
GB memory modules can be mixed).
• Depending on mode-specific guidelines, populate four DIMMs per processor (one DIMM per channel) at a time to maximize
performance. For more information, see the Mode-specific guidelines section.
Table 21. Heat sink — processor configurations
Processor
Configuration
Processor Type (in Watts) Heat
Sink
Width
Number of DIMMs
Maximum System Capacity Reliability, Availability, and
Serviceability (RAS) Features
Dual processor Up to 135 W 74 mm 24 24
Quad processor Up to 105 W 74 mm 48 48
120 W or 135 W 94 mm 40 (Three DIMMs in channel 0
and channel 2 and two DIMMs
in channel 1 and channel 3)
32 (Two DIMMs per channel)
64 Installing server module components