Memory channels are organized as follows:Processor 1 channel 0: memory sockets A1 and A3channel 1: memory sockets A2 and A4The following table shows the memory populations and operating frequencies for the supportedconfigurations:Table 20. Memory populations and operating frequencies for the supported configurationsMemory module type Memory modulespopulated perchannelOperating frequency(in MT/s) Maximum memory moduleranks per channel1.2 VECC (UDIMM) 1 2133 Dual rank or single rank2 2133 Dual rank or single 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:• x4 and x8 DRAM-based memory modules can be mixed. For more information, see the Mode-specificguidelines section.• Up to two dual- or single-rank UDIMMs can be populated per channel.• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A4are available.• If memory modules with different speeds are installed, they operate at the speed of the slowestinstalled memory module(s) or slower depending on system DIMM configuration.• When mixing memory modules with different capacities, populate the sockets with memory moduleswith the highest capacity first. For example, to mix 4 GB and 8 GB DIMMs, populate 8 GB DIMMs inthe sockets with white release levers and 4 GB DIMMs in the sockets with black release levers.• 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).Sample memory configurationsThe following table shows sample memory configurations for a single processor configuration.NOTE: 1R and 2R in the following table indicate single and dual-rank memory modules respectively.59
