Dell EMC PowerEdge R640 Manual - Page 19

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The PowerEdge R640 supports up to 1536 GB (RDIMM) or 768 GB (LRDIMMs) of memory (24 DIMMs), and at speeds up to 2666 MT/s,

providing high performance in various applications. High memory density ensures that there is no compromise in virtualization.

The PowerEdge R640 supports both registered DIMMs (RDIMM) and load-reduced DIMMs (LRDIMMs), which use a buffer to reduce

memory loading and provide greater density, allowing for the maximum platform memory capacity.

Mixing of DIMM types is not supported ‐ either the platform is populated with all RDIMMs, or all LRDIMMs. Maximum

NOTE:

two types of DIMMs allowed per system and only NVDIMM-Ns and RDIMMs are supported. NVDIMM-Ns are only supported on

CPU 1 and CPU 2, that is, six per CPU with a total of 12. RDIMM with LRDIMM and LRDIMM with NVDIMM-N cannot be mixed.

The system supports:

•

Up to six channels with two DPC and total 24 DIMMs

•

DDR4 RDIMM/LRDIMM/NVDIMM-N

•

Only registered ECC DDR4 DIMMs

•

DDR4 speeds up to 2666 MT/s

DIMMs supported

Table 6. Memory technologies

Feature

Buffer

Frequencies

Ranks supported

Capacity per DIMM

Maximum DIMMs per channel

DRAM technology

Temperature sensor

Error Correction Code (ECC)

Single Device Disable Code

(SDDC)

Address parity

RDIMM

Yes

Up to 2666 MT/s

Single or dual rank

4 GB, 8 GB, 16 GB, 32 GB or 64

x4 or x8

Yes

LRDIMM

Yes

Up to 2666 MT/s

Quad rank

32 GB

1, 2

Yes

Memory

NVDIMM-N

Yes

Up to 2666 MT/s

Single rank

16 GB

1x NVDIMM-N for each channel

Combined 2x (NVDIMM-N

+RDIMM) for each channel

Yes

Memory