Dell PowerEdge XE9685L Installation and Service Manual

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System memory guidelines

The PowerEdgeXE9685L system supports DDR5 registered DIMMs (RDIMMs). System memory holds the instructions that are started by the processor.

Your system memory is organized into 12 channels per processor (one memory sockets per channel),12 memory sockets per processor and 24 memory sockets per system.

This image shows memory location PowerEdgeXE9685L — Figure 1. Memory channels

Memory channels are organized as follows:

Table 1. Memory channels A through FThe table describes memory channels and how the channels are organized.
Processor	Channel A	Channel B	Channel C	Channel D	Channel E	Channel F
Processor 0	Slots A1	Slots A5	Slots A3	Slots A9	Slots A7	Slots A11
Processor 1	Slots B1	Slots B5	Slots B3	Slots B9	Slots B7	Slots B11

Table 2. Memory channels G through LThe table describes memory channels and how the channels are organized.
Processor	Channel G	Channel H	Channel I	Channel J	Channel K	Channel L
Processor 0	Slots A2	Slots A6	Slots A4	Slots A10	Slots A8	Slots A12
Processor 1	Slots B2	Slots B6	Slots B4	Slots B10	Slots B8	Slots B12

Table 3. Supported memory matrixThe table describes the supported memory matrix.
DIMM type	Rank	Capacity	DIMM rated voltage and speed	Operating Speed
DIMM type	Rank	Capacity	DIMM rated voltage and speed	1 DIMM per channel (DPC)
RDIMM	2 R	64 GB	DDR5 (1.1 V), 6400 MT/s	Up to 6400 MT/s
		96 GB	DDR5 (1.1 V), 6400 MT/s
		128 GB	DDR5 (1.1 V), 6400 MT/s

NOTE:The processor may reduce the performance of the rated DIMM speed.

NOTE:Maximum DIMM transfer speed support dependent on CPU SKU and DIMM population.