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Four green DDR4 LRDIMM modules with gold contacts, no heat spreaders

OWC

OWC 512GB (4x128GB) DDR4 2933 CL21 ECC LRDIMM memory upgrade

SKU CH-8Y7K-3FDKT

Kit of four 128 GB DDR4 2933 CL21 ECC load-reduced DIMMs adding 512 GB to compatible Dell PowerEdge servers

  • Total capacity512 GB (4 × 128 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank8Rx4

Capacity 512GB (4 x 128GB)

  • 512 GB total capacity across four 128 GB modules
  • DDR4 2933 MT/s speed with CL21 latency for responsive server performance
  • ECC load-reduced design detects and corrects data errors in critical workloads
  • 2 V operation reduces power draw in dense memory configurations
  • Validated for Dell PowerEdge R740, R740XD, R940 and T640 systems

Server-grade memory kit

This OWC kit supplies 512GB of DDR4 ECC load-reduced DIMMs in four 128GB modules. It targets administrators upgrading Dell PowerEdge R740, R740XD, R940 or T640 servers that require registered memory with error correction. The modules run at 2933MHz with CL21 latency and 1.2V operation.

Thermals and power

Each module operates at the standard 1.2V DDR4 voltage without a heat spreader, relying on server chassis airflow for cooling. Load-reduced buffering reduces electrical load on the memory bus, helping keep power draw predictable in fully populated configurations. The JEDEC-compliant design ensures stable operation within the thermal envelope of the supported PowerEdge platforms.

Build integration

The 288-pin LRDIMMs install directly into the DDR4 slots of the listed Dell servers and cannot be mixed with unbuffered or standard registered DIMMs. Backward compatibility with 2133MHz, 2400MHz and 2666MHz bus speeds allows deployment in systems that have not yet been updated to the highest supported frequency. The four-module kit fills four DIMM slots, leaving remaining slots available for further expansion within the platform limits.

How it compares

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

Price $2,676.99
Pricier than about 72% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $5.23 per GB
Cheaper than about 74% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D48R4512S
Total capacity512 GB (4 × 128 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsDell PowerEdge R740
Dell PowerEdge R740XD
Dell PowerEdge R940
Dell PowerEdge T640

Other versions of this model

5 more in the same range

Questions about this item

How do I install the four 288-pin LRDIMM modules in a Dell PowerEdge R740, and which step do people often get wrong?

Power down the server, open the chassis, and seat each 128GB module fully until the ejector clips click; the common mistake is mixing these 8Rx4 load-reduced DIMMs with unbuffered or registered ECC memory, which the platform will not accept.

What maintenance or replacement will this 512GB kit need later?

No scheduled maintenance is required; if a module fails it is replaced individually under the limited lifetime warranty, and the only practical change later would be adding more kits up to the server's maximum supported capacity.

What limit appears first when the memory runs at 2933 MT/s under sustained load?

The thermal limit of the unbuffered PCB without a heat spreader is reached before any electrical throttle, so adequate chassis airflow must be maintained to keep the 1.2V modules within specification.

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