Dell PowerEdge R620 Owner's Manual

System memory

Your system supports DDR3 unbuffered ECC DIMMs (ECC UDIMMs), registered DIMMs (RDIMMs), and load reduced DIMMs (LRDIMMs). It supports DDR3 and DDR3L voltage specifications.

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

Memory bus operating frequency can be 1866 MT/s, 1600 MT/s, 1333 MT/s, 1066 MT/s, or 800 MT/s depending on:

DIMM type (UDIMM, RDIMM, or LRDIMM)
DIMM configuration (number of ranks)
maximum frequency of the DIMMs
number of DIMMs populated per channel
DIMM operating voltage
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.

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

Memory channels are organized as follows:

Table 1. Memory channels. This 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.

DIMM Type	DIMMs Populated/Channel	Operating Frequency (in MT/s)		Maximum DIMM Rank/Channel
		1.5 V	1.35 V
UDIMM ECC	1	1600, 1333, 1066, and 800	1600, 1333, 1066 and 800	Dual rank
UDIMM ECC	2	1600, 1333, 1066, and 800	1600, 1333, 1066 and 800	Dual rank
RDIMM	1	1866, 1600, 1333, 1066, and 800	1600, 1333, 1066, and 800	Dual rank
	1	1333, 1066 and 800	1066 and 800	Quad rank
	2	1866, 1600, 1333, 1066, and 800	1600, 1333, 1066, and 800	Dual rank
	2	1066 and 800	1066 and 800	Quad rank
	3	1333, 1066, and 800	1066 and 800	Dual rank
LRDIMM	1	1866, 1600, 1333 and 1066	1600, 1333 and 1066	Quad rank
	1	1600, 1333 and 1066	Not applicable	Octal rank
	2	1600, 1333 and 1066	1600, 1333 and 1066	Quad rank
	2	1600, 1333 and 1066	Not applicable	Octal rank
	3	1333 and 1066	1066	Quad rank
	3	1333 and 1066	Not applicable	Octal rank

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Dell PowerEdge R620 Owner's Manual

System memory

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