channel 3: slots B4, B8, and B12The following table shows the memory populations and operating frequencies for the supportedconfigurations.DIMM Type DIMMs Populated/Channel Operating Frequency (inMT/s) Maximum DIMM Rank/Channel1.2 VRDIMM 1 2133, 1866, 1600, 1333 Dual rank or single rank2 2133, 1866, 1600, 1333 Dual rank or single rank3 1866, 1600, 1333 Dual rank or single rankLRDIMM 1 2133, 1866, 1600, 1333 Quad rank2 2133, 1866, 1600, 1333 Quad rank3 1866, 1600, 1333 Quad rankGeneral memory module installation guidelinesThis system supports Flexible Memory Configuration, enabling the system to be configured and run inany valid chipset architectural configuration. The following are the recommended guidelines for installingmemory modules:• RDIMMs and LRDIMMs must not be mixed.• x4 and x8 DRAM based DIMMs can be mixed. For more information, see Mode-specific guidelines.• Up to three dual- or single-rank RDIMMs can be populated per channel.• Up to three LRDIMMs can be populated per channel regardless of rank count.• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 toA12 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.• Populate the sockets by highest rank count in the following order — first in sockets with white releaselevers, then black, and then green. For example, if you want to mix single-rank and dual-rank DIMMs,populate dual-rank DIMMs in the sockets with white release tabs and single-rank DIMMs in thesockets with black release tabs.• When mixing memory modules with different capacities, populate the sockets with memory moduleswith highest capacity first. For example, if you want to mix 4 GB and 8 GB DIMMs, populate 8 GBDIMMs in the sockets with white release tabs and 4 GB 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, andso on.• Memory modules of different capacities can be mixed provided other memory population rules arefollowed (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 four DIMMs per processor (one DIMM per channel) at a time to maximize performance.Mode-specific guidelinesFour memory channels are allocated to each processor. The allowable configurations depend on thememory mode selected.76
