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Green DDR4 RDIMM module with black chips and gold contacts

NEMIX RAM

NEMIX RAM 16GB DDR4 2933MHz ECC RDIMM 2Rx8 CL21 1.2V 288-Pin Dell PowerEdge M640 memory upgrade

SKU CH-443V-C8D7M

16 GB DDR4 ECC registered server memory at 2933 MHz CL21 for Dell PowerEdge M640

  • Total capacity16 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL21
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • ECC protection guards data integrity in critical workloads
  • Registered design stabilises signal quality for dense server configurations
  • 2933 MHz DDR4 speed matches Dell PowerEdge M640 specifications
  • 2 V operation reduces power draw per module
  • 2Rx8 dual-rank layout maximises capacity per slot

Dell PowerEdge M640 memory upgrade

This 16GB DDR4 2933MHz ECC registered DIMM is built for the Dell PowerEdge M640 server. It delivers 16GB of capacity in a single 288-pin module that operates at 1.2V with CL21 latency. The 2Rx8 organisation and on-board error correction suit virtualised workloads and databases that need data integrity.

Replacing slower or smaller DDR4 RDIMMs

Swapping out lower-speed DDR4 modules or smaller-capacity sticks raises both bandwidth and total memory headroom for the M640. The jump is worth it when the server runs near its current memory ceiling or when the existing DIMMs run below 2933MHz, because the higher data rate feeds more instructions per clock to the CPU.

Fitting into an M640 build

The module plugs directly into the server’s 288-pin DDR4 RDIMM slots and draws 1.2V without extra cooling hardware. It frees a slot that a pair of 8GB DIMMs would occupy, leaving room for future expansion while keeping the memory subsystem registered and ECC-protected.

How it compares

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

Price $117.99
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 $7.37 per GB
Cheaper than about 55% 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

Will this 288‑pin DDR4 RDIMM fit the memory slots in a Dell PowerEdge M640?

Yes, the 288‑pin DDR4 RDIMM form factor matches the slots used by the PowerEdge M640 server.

What is the correct way to seat this registered ECC module, and what step is often missed?

Align the notch with the slot key, press firmly until both retention clips click, then verify in BIOS that the module registers as 2933 MHz ECC.

When should this 1.2 V ECC RDIMM be replaced in a production server?

Replace it if memory diagnostics report correctable ECC errors that increase over time or if the server logs uncorrectable memory faults.

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