Dell PowerEdge R730xd Owner's Manual

System memory

The system supports DDR4 registered DIMMs (RDIMMs) and load reduced DIMMs (LRDIMMs). System memory holds the instructions that are executed by the processor.

NOTE: MT/s indicates DIMM speed in MegaTransfers per second.

Memory bus operating frequency can be 1866 MT/s, 2133 MT/s, or 2400 MT/s depending on the following factors:

DIMM type (RDIMM or LRDIMM)
Number of DIMMs populated per channel
System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
Maximum supported DIMM frequency of the processors

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

This figure helps in locating memory sockets. — Figure 1. Memory socket locations

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
Processor 1	Slots A1, A5, and A9	Slots A2, A6, and A10	Slots A3, A7, and A11	Slots A4, A8, and A12
Processor 2	Slots B1, B5, and B9	Slots B2, B6, and B10	Slots B3, B7, and B11	Slots B4, B8, and B12

The following table shows the memory populations and operating frequencies for the supported configurations:

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	2400, 2133, 1866	Dual rank or single rank
	2		2400, 2133, 1866	Dual rank or single rank
	3		1866	Dual rank or single rank
LRDIMM	1	1.2 V	2400, 2133, 1866	Quad rank
	2		2400, 2133, 1866	Quad rank
	3		2133, 1866	Quad rank

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Dell PowerEdge R730xd Owner's Manual

System memory

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