Dell EMC PowerEdge MX740c Installation and Service Manual

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System memory

The system supports DDR4 registered DIMMs (RDIMMs), load reduced DIMMs (LRDIMMs), Non-Volatile DIMMs (NVDIMM-Ns), and Intel Optane Data Center Persistent Memory Modules (DCPMMs). System memory holds the instructions that are executed by the processor.

Your system contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is organized into six channels. Six memory channels are allocated to each processor. In each channel, the release tabs of the first socket are marked white, and the second socket black.

The image shows system memory layout — Figure 1. System memory layout

Memory channels are organized as follows:

Table 1. Memory channelsThis tables describes memory channels and how the channels are organized.
Channel	Processor 1	Processor 2
0	Slots A1 and A7	Slots B1 and B7
1	Slots A2 and A8	Slots B2 and B8
2	Slots A3 and A9	Slots B3 and B9
3	Slots A4 and A10	Slots B4 and B10
4	Slots A5 and A11	Slots B5 and B11
5	Slots A6 and A12	Slots B6 and B12

Table 2. Memory populationThis table describes the memory population and the operating frequencies.
DIMM Type	DIMM Ranking	Voltage	Operating Frequency (in MT/s)
RDIMM	1R / 2R	1.2 V	2933, 2666
LRDIMM	4R / 8R	1.2 V	2666 , 3200*

NOTE 3200*-Memory speed will be limited to 2933MT/s due to processor limitations.