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Green rectangular DDR4 RDIMM module with black chips, gold edge connector, no heat spreader

NEMIX RAM

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

SKU CH-KAT0-J6J09

16 GB DDR4 2933 ECC registered RDIMM, CL21 1.2 V 2Rx8 288-pin for Dell PowerEdge R840

  • Total capacity16 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL21
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 16 GB capacity expands server memory headroom
  • DDR4 2933 speed matches Dell PowerEdge R840 specifications
  • ECC registered design protects data integrity under load
  • 2 V operation reduces power draw per module
  • 288-pin RDIMM form factor fits standard server slots

Dell PowerEdge R840 DDR4 RDIMM

This NEMIX RAM module provides 16 GB of DDR4 2933 registered ECC memory for the Dell PowerEdge R840 rack server. It operates at 1.2 V with a CAS latency of CL21 and uses a 2Rx8 organisation on a 288-pin RDIMM form factor. The part is built with major OEM chips from Samsung, Micron or Hynix and carries the supplier part number MR23400-628K1.

IT teams maintaining R840 fleets

Administrators expanding memory in a Dell PowerEdge R840 will find this module validated for that platform. Builders working on non-Dell servers, desktop workstations or consumer motherboards should look elsewhere because the registered ECC design requires a compatible server chipset and memory controller.

Registered ECC DDR4 2933 CL21

The single specification that determines fit is the registered ECC DDR4 2933 CL21 2Rx8 288-pin RDIMM profile at 1.2 V. Only systems that explicitly support this exact combination of speed, latency, rank structure and registered signalling will accept the module.

How it compares

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

Price $119.99
Cheaper than about 65% 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 $7.50 per GB
Cheaper than about 54% 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 this RDIMM require a Dell PowerEdge R840 server to function?

This module is built for the Dell PowerEdge R840 and operates as registered ECC DDR4; the server must accept 288-pin DDR4 RDIMMs at 2933 MT/s with 1.20 V.

Can I mix this 16 GB 2Rx8 CL21 stick with existing DDR4 RDIMMs running at a lower speed?

The R840 will down-clock all modules to the slowest installed speed and use the loosest timing, so mixing works but the faster 2933 MT/s rating on this stick will not be used.

How do I verify the module is running at 2933 MT/s with ECC active after installation?

Enter the system BIOS or iDRAC and confirm the memory speed shows 2933 MT/s, the rank reads 2Rx8, and ECC status reports enabled.

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