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Green bare circuit board DDR4 RDIMM module with black memory chips and gold edge connectors

NEMIX RAM

NEMIX RAM 16GB DDR4 2933MHz ECC RDIMM 2Rx8 CL21 1.2V 288-Pin Dell PowerEdge R840 Compatible memory upgrade

SKU CH-SFXS-9GFDV

16 GB DDR4 2933 MHz ECC registered DIMM for Dell PowerEdge R840 servers

  • Total capacity16 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL21
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • ECC protection safeguards data integrity in Dell PowerEdge R840 servers
  • 16 GB capacity expands system memory for demanding workloads
  • 2933 MHz DDR4 speed delivers high bandwidth for server applications
  • Registered 2Rx8 design ensures signal stability on multi-module configurations
  • 2 V operation reduces power draw in enterprise environments

Dell PowerEdge R840 compatible DDR4 RDIMM

This 16 GB DDR4 registered DIMM operates at 2933 MHz with CL21 latency and 1.2 V power draw. It uses a 2Rx8 organisation and ECC for data integrity in Dell PowerEdge R840 servers. The 288-pin module installs directly into registered memory slots.

Suited for Dell PowerEdge R840 memory expansion

Ideal for administrators adding ECC registered capacity to a compatible Dell PowerEdge R840 platform. Not suitable for systems requiring unbuffered UDIMM modules, non-ECC memory, or a different DDR generation. Builders needing other form factors or voltages should select alternative parts.

Registered ECC with 2Rx8 organisation

The module implements registered ECC DDR4 with a 2Rx8 rank configuration, a combination the Dell PowerEdge R840 memory controller expects. Verifying that the server requires registered ECC RDIMMs with this rank structure confirms compatibility before purchase.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $107.99
Cheaper than about 67% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.75 per GB
Cheaper than about 59% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineDell Server/Workstation Compatible Series Memory
Model nameDell DDR4 2933 MHz RDIMM Registered Server Memory
Part numberMR23400-628K1
Total capacity16 GB
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL21
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell
In the box
Included items16 GB (1 × 16 GB) DDR4 2933 MHz PC4-23400 2Rx8 1.2 V CL21 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Does my Dell PowerEdge R840 need to support DDR4 2933 ECC registered RDIMM modules for this 16GB stick to function?

Yes, the server must accept DDR4 2933 ECC registered RDIMM memory; this module is a 288-pin 1.2V CL21 2Rx8 stick built to that specification.

Will this 2933MHz registered ECC module run at a lower speed if the R840 is populated with slower DDR4 RDIMMs?

The module will operate at the highest common speed supported by the memory controller and any other installed DDR4 RDIMMs, so it can downclock to match slower sticks.

How can I confirm the R840 recognises the full 16GB capacity and ECC function after installation?

Check the system BIOS or iDRAC interface — both will show 16GB per module and report ECC status as active when the registered DIMM is seated correctly.

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