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OWC

OWC 128GB DDR4 2933 CL21 8Rx4 288-pin 1.2V ECC RDIMM 2R9D48R4128G

SKU CH-KKDE-WMAYX

A 128GB DDR4 2933 ECC registered DIMM for Dell PowerEdge T640, R740xd, R840, R940 and R940xa servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB single-module capacity expands server memory efficiently
  • DDR4 2933MHz speed with CL21 latency delivers responsive performance
  • ECC registered technology ensures data integrity for critical workloads
  • 2V operation reduces power consumption in dense configurations
  • Compatible with Dell PowerEdge T640, R740xd, R840, R940, R940xa servers

Server Memory Upgrade

This 128GB DDR4 2933 MT/s ECC registered DIMM is built for Dell PowerEdge servers including the T640, R740xd, R840, R940 and R940xa. It delivers a single-module capacity increase for workloads that demand maximum memory density per slot. The module operates at 1.2V with a CL21 latency and conforms to JEDEC PC4-23400 specifications.

Fitment Guidance

The part suits administrators expanding compatible PowerEdge platforms where the memory controller supports 8Rx4 registered ECC modules. It will not work in standard desktop mainboards, consumer workstations or systems that require unbuffered or load-reduced DIMMs. Mixing this registered module with other ECC types is not supported by the platform memory architecture.

Deciding Specification

The 8Rx4 rank organisation is the critical parameter; the server memory controller must explicitly support this rank structure for the module to initialise. Verify the platform documentation for 8Rx4 registered DIMM qualification before purchase.

How it compares

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

Price $658.99
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 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $5.15 per GB
Cheaper than about 75% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell PowerEdge T640
Dell PowerEdge R740xd
Dell PowerEdge R840
Dell PowerEdge R940
Dell PowerEdge R940xa

Questions about this item

Will the 288-pin DDR4 RDIMM fit the memory slots on my Dell PowerEdge R740xd?

Yes, the module uses the standard 288-pin DDR4 RDIMM form factor required by the PowerEdge R740xd, R840, R940 and T640.

Do I need to install this 128GB ECC registered DIMM in matched pairs or specific channels?

Install the DIMM in the slot sequence shown in the server service manual; the common mistake is placing a single 8Rx4 module in a channel that the BIOS expects to be populated in pairs.

When should I expect to replace this 1.2V DDR4 2933 module in a 24/7 server?

ECC registered DDR4 modules typically run for the server's service life; plan replacement only if SMART health monitoring reports correctable error counts rising above threshold.

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