Dell Precision Rack 7910 Owner's Manual

System memory

Your system supports DDR4 registered DIMMs (RDIMMs), and load reduced DIMMs (LRDIMMs).

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

Memory bus operating frequency can be 1866 MT/s, or 2133 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

The 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 levers of the first socket are marked white, the second socket black, and the third socket green.

NOTE:DIMMs in sockets A1 to A12 are assigned to processor 1 and DIMMs in sockets B1 to B12 are assigned to processor 2.

This figure helps in locating memory sockets.

Memory channels are organized as follows:

Processor 1: channel 0: slots A1, A5, and A9; channel 1: slots A2, A6, and A10; channel 2: slots A3, A7, and A11; channel 3: slots A4, A8, and A12
Processor 2: channel 0: slots B1, B5, and B9; channel 1: slots B2, B6, and B10; channel 2: slots B3, B7, and B11; channel 3: slots B4, B8, and B12

Table 1. Memory populationThe following table shows the memory populations and operating frequencies for the supported configurations.
DIMM Type	DIMMs Populated/Channel	Operating Frequency (in MT/s)	Maximum DIMM Rank/Channel
		1.2 V
RDIMM	1	2133, 1866, 1600, 1333	Dual rank or single rank
	2	2133, 1866, 1600, 1333	Dual rank or single rank
	3	1866, 1600, 1333	Dual rank or single rank
LRDIMM	1	2133, 1866, 1600, 1333	Quad rank
	2	2133, 1866, 1600, 1333	Quad rank
	3	1866, 1600, 1333	Quad rank

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Dell Precision Rack 7910 Owner's Manual

System memory

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