Dell EMC PowerEdge R740xd2 Installation and Service Manual

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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.

This image shows system memory slots. — Figure 1. System memory

Memory channels are organized as follows:

Table 1. Memory channelsThis tables describes memory channels and how the channels are organized.
Processor	Channel 0	Channel 1	Channel 2	Channel 3	Channel 4	Channel 5
Processor 1	Slots A1 and A7	Slots A2 and A8	Slots A3	Slots A4 and A9	Slots A5 and A10	Slots A6
Processor 2	Slots B1	Slots B2	Slots B3	Slots B4	Slots B5	Slots B6

Table 2. Memory populationThis table describes the memory population and the operating frequencies.
DIMM Type	DIMMs Populated/Channel	Voltage	Operating Frequency (in MT/s)	Maximum DIMM Rank/Channel
RDIMM	1	1.2 V	2933, 2666, 2400, 2133, 1866	Dual rank or single rank
RDIMM	2	1.2 V	2933, 2666, 2400, 2133, 1866	Dual rank or single rank