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Green 288-pin DDR4 ECC registered RDIMM module with black chips

OWC

OWC 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM for Dell PowerEdge MX840c XR2

SKU CH-M9FQ-KA9W4

A single 128GB DDR4 2666 ECC registered RDIMM for Dell PowerEdge MX840c and XR2 servers

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB capacity fits dense server workloads in a single module
  • ECC registered design protects data integrity for critical applications
  • 2666MHz speed with CL19 latency delivers responsive DDR4 performance
  • 2V operation reduces power draw in Dell PowerEdge MX840c and XR2
  • JEDEC and RoHS compliant for warranty-safe upgrades

Server-grade ECC upgrade

This 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM is built for Dell PowerEdge MX840c and XR2 servers. It targets administrators who need a single high-capacity module to expand memory in compatible enterprise systems.

JEDEC compliant registered design

The module uses a registered ECC layout with 8Rx4 organisation and operates at 1.2V without a heat spreader. Its 288-pin form factor fits only platforms that support DDR4 ECC registered memory and cannot be mixed with unbuffered or load-reduced DIMMs.

Replaces lower-density DDR4 RDIMMs

The upgrade suits servers currently running 2133MHz or 2400MHz registered ECC modules and benefits workloads that demand maximum capacity per slot. It is not for desktops, workstations without registered ECC support, or systems requiring unbuffered memory.

How it compares

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

Price $648.99
Pricier than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 19
Lower than about 70% of the 483 comparable items (median 22).
Price per GB $5.07 per GB
Cheaper than about 76% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R6D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell PowerEdge MX840c
Dell PowerEdge XR2

Questions about this item

What DDR4 speed does the PC4-21300 rating cap at for this 128GB module?

The PC4-21300 rating means the module runs at 2666MHz with CL19 latency. It will downclock to 2400MHz or 2133MHz if the server platform requires it.

What physical slot and form factor does this 288-pin RDIMM need in the PowerEdge MX840c or XR2?

It fits a standard 288-pin DDR4 RDIMM slot. The module has no heat spreader, so it occupies a single DIMM height in the server's memory risers.

How is this ECC Registered DIMM installed, and what mixing mistake do people make?

Power down the server, open the chassis, align the notch with the keyed slot, and press firmly until the ejectors click. Do not mix it with unbuffered or load-reduced ECC memory.

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