Dell Precision 7920 Rack 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 2133 MT/s, 2400 MT/s, or 2666 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-sockets is organized into six channels. Two sockets per channel with the release tabs of the first socket marked white and the second socket black.

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

Table 1. Maximum memory moduleTable describes Maximum memory module
Frequency supported	Processors
2133	31xx series
2400	41xx series
2400	51xx series
2666	61xx series

Memory channels are organized as follows:

Table 2. 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
CPU 1	Slots A1, A7	Slots A2, A8	Slots A3, A9	Slots A4, A10	Slots B5, A11	Slots A6, A12
CPU2	Slots B1, B7	Slots B2, B8	Slots B3, B9	Slots B4, B10	Slots B5, B11	Slots B6, B12

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Dell Precision 7920 Rack Owner's Manual

System memory

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