Dell PowerEdge T420, Owner'S Manual

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Figure 35. Memory Socket Locations
Processor 1 channel 1: memory sockets A1 and A4
channel 2: memory sockets A2 and A5
channel 3: memory sockets A3 and A6
Processor 2 channel 1: memory sockets B1 and B4
channel 2: memory sockets B2 and B5
channel 3: memory sockets B3 and B6
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 and RDIMMs 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.
• A maximum of two quad-rank RDIMMs can be populated in a channel.
• A maximum of two single- or dual-rank RDIMMs can be populated in a channel.
• One quad-rank RDIMM and one single- or dual-rank RDIMM can be populated per channel.
• Populate DIMM sockets only if a processor is installed. For single-processor systems, sockets A1 to A6 are
available. For dual-processor systems, sockets A1 to A6 and sockets B1 to B6 are available.
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