Dell EMC PowerEdge R7425 Installation and Service Manual

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Memory specifications

The PowerEdge R7425 system supports up to thirty two 288-pins RDIMMs, and LRDIMMs with speeds of 2666 MT/s, 2400 MT/s, 2133 MT/s, and 1866 MT/s with support for memory optimized operation.

Table 1. Memory specificationsThe table below shows the memory specifications for the R7425 system:
DIMM type	DIMM rank	DIMM capacity	Single processor		Dual processors
DIMM type	DIMM rank	DIMM capacity	Minimum RAM	Maximum RAM	Minimum RAM	Maximum RAM
LRDIMM	Quad rank	64GB	64GB	1TB	128GB	2TB
RDIMM	Single rank	8GB	8GB	128GB	16GB	256GB
RDIMM	Dual rank	16GB	16GB	256GB	32GB	512GB
RDIMM	Dual rank	32GB	32GB	512GB	64GB	1024GB

NOTE For optimal performance, it is recommended to populate one DIMM per channel with DDR4, 2666 MT/s memory modules on the first slot of each memory channel. The first slot of each channel can be identified as the DIMM slots with white latches. For example, 64 GB system memory capacity can be divided into 8 x 8 GB DIMM slots.