Memory; Dimms Supported - Dell PowerEdge R640 Manual

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
Register
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
No
Up to 2666 MT/s
Single or dual rank
4 GB, 8 GB, 16 GB, 32 GB or 64
GB
2
x4 or x8
Yes
Yes
Yes
Yes
LRDIMM
Yes
Yes
Up to 2666 MT/s
Quad rank
32 GB
1, 2
x4
Yes
Yes
Yes
Yes
5

Memory

NVDIMM-N
Yes
No
Up to 2666 MT/s
Single rank
16 GB
1x NVDIMM-N for each channel
Or
Combined 2x (NVDIMM-N
+RDIMM) for each channel
x4
Yes
Yes
Yes
Yes
Memory 19