Dell PowerEdge R640 - Memory; DIMMs supported

Memory
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 buer to reduce
memory loading and provide greater density, allowing for the maximum platform memory capacity.
NOTE: Mixing of DIMM types is not supported ‐ either the platform is populated with all RDIMMs, or all LRDIMMs. Maximum
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 RDIMM LRDIMM NVDIMM-N
Register Yes Yes Yes
Buer No Yes No
Frequencies Up to 2666 MT/s Up to 2666 MT/s Up to 2666 MT/s
Ranks supported Single or dual rank Quad rank Single rank
Capacity per DIMM 4 GB, 8 GB, 16 GB, 32 GB or 64
GB
32 GB 16 GB
Maximum DIMMs per channel 2 1, 2 1x NVDIMM-N for each channel
Or
Combined 2x (NVDIMM-N
+RDIMM) for each channel
DRAM technology x4 or x8 x4 x4
Temperature sensor Yes Yes Yes
Error Correction Code (ECC) Yes Yes Yes
Single Device Disable Code
(SDDC)
Yes Yes Yes
Address parity Yes Yes Yes
5
Memory 19