DIMM Type DIMMs Populated/
Channel
Operating Frequency (in MT/s) Maximum DIMM Rank/
Channel
1.5 V 1.35 V
UDIMM ECC 1 1333, 1066, and 800 1066 and 800 Dual rank
2 1333, 1066, and 800 1066 and 800 Dual rank
RDIMM 1 1600, 1333, 1066, and
800
1333, 1066, and 800 Dual rank
1066 and 800 800 Quad rank
2 1600, 1333, 1066, and
800
1333, 1066, and 800 Dual rank
800 800 Quad rank
3 1066 and 800 Not Applicable Dual rank
LRDIMM 1 1333 and 1066 1333 and 1066 Quad rank
2 1333 and 1066 1333 and 1066 Quad rank
3 1066 1066 Quad rank
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 best performance:
• UDIMMs, RDIMMs, and LRDIMMs must not be mixed.
• x4 and x8 DRAM based DIMMs can be mixed. For more information, see Mode-Specific Guidelines.
• A maximum of two UDIMMs can be populated in a channel.
• Up to two quad-rank RDIMMs and up to three dual- or single-rank RDIMMs can be populated per channel.
When a quad-rank RDIMM is populated in the first slot with white release levers, the third DIMM slot in the
channel with green release levers cannot be populated.
• Up to three LRDIMMs can be populated 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.
• Do not populate the third DIMM socket in a channel with green release tabs, if a quad-rank RDIMM is populated
in the first socket with white release tabs.
• 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 quad-rank and dual-rank DIMMs, populate quad-
rank DIMMs in the sockets with white release tabs and dual-rank 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 sizes can be mixed provided that other memory population rules are followed (for
example, 2 GB and 4 GB memory modules can be mixed).
• Populate four DIMMs per processor (one DIMM per channel) at a time to maximize performance.
• 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.
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