Table 35. Memory channelsProcessor Channel 0 Channel 1 Channel 2 Channel 3Processor 1Slots A1, A5, and A9 Slots A2, A6, and A10 Slots A3, A7, and A11 Slots A4, A8, and A12Processor 2Slots B1, B5, and B9 Slots B2, B6, and B10 Slots B3, B7, and B11 Slots B4, B8, and B12The following table shows the memory populations and operating frequencies for the supportedconfigurations:Table 36. Memory populationDIMMType DIMMsPopulated/Channel Voltage OperatingFrequency (in MT/s) Maximum DIMM Rank/ChannelRDIMM 11.2 V2400, 2133, 1866 Dual rank or single rank2 2400, 2133, 1866 Dual rank or single rank3 1866 Dual rank or single rankLRDIMM 11.2 V2400, 2133, 1866 Quad rank2 2400, 2133, 1866 Quad rank3 2133, 1866 Quad rankGeneral memory module installation guidelinesNOTE: Memory configurations that fail to observe these guidelines can prevent your system frombooting, 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 anyvalid chipset architectural configuration. The following are the recommended guidelines for installingmemory modules:• RDIMMs and LRDIMMs must not be mixed.• x4 and x8 DRAM based memory modules can be mixed. For more information, see the Mode-specificguidelines section.• 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.• If memory modules with different speeds are installed, they will operate at the speed of the slowestinstalled memory module(s) or slower depending on system DIMM configuration.• Populate memory module 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 B12are available.• Populate all the sockets with white release tabs first, followed by the black release tabs, and then thegreen 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 memory modules, populate8 GB memory modules in the sockets with white release tabs and 4 GB memory modules in thesockets with black release tabs.102
