Dell EMC PowerEdge R740xd2 - System Memory; System Memory Guidelines

Figure 71. Cable routing - System with 2 x 3.5-inch rear drive backplane connected to system board SATA port
System memory
System memory guidelines
The PowerEdge systems support DDR4 Registered DIMMs (RDIMMs). System memory holds the instructions that are executed by the
processor.
Your system contains 16 memory sockets. Processor 1 supports up to 10 memory sockets and Processor 2 supports up to 6 memory
sockets. Six memory channels are allocated to each processor. Processor 1 has four 2 DIMM slots per channel and two 1 DIMM slot per
channel. Processor 2 has six 1 DIMM per channel.
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Installing and removing system components