Dell PowerEdge M820 Dell PowerEdge M820 Systems Owner's Manual - Page 53

channel 2: memory sockets C3, C7, and C11 channel 3: memory sockets C4, C8, and C12 Processor 4 channel 0: memory sockets D1, D5, and D9 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. DIMM Type RDIMM DIMMs Populated/ Channel 1.5 V Operating Frequency (in MT/s) 1.35 V 1 1600, 1333, 1066, and 1333, 1066, and 800 800 Maximum DIMM Rank/ Channel Dual rank 1333, 1066, and 800 1066 and 800 Quad rank 2 1600, 1333, 1066, and 1333, 1066, and 800 Dual rank 800 1066 and 800 1066 and 800 Quad rank 3 1333, 1066, and 800 1066 and 800 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: • 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 two quad-rank RDIMMs and up to three dual- or single-rank RDIMMs can be populated per channel. • Up to three LRDIMMs can be populated regardless of rank count. • Populate DIMM sockets only if a processor is installed. For dual-processor systems, sockets A1 to A12 and B1 to B12 are available. For four-processor systems, sockets A1 to A12, B1 to B12, C1 to C12, and D1 to D12 are available. • 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, 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- or four-processor configuration, the memory configuration for each processor must be identical. For example, if you populate socket A1 for processor 1, then you must 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 operate at the speed of the slowest installed memory module(s) or slower depending on system DIMM configuration. 53