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OWC

OWC 512GB (4×128GB) DDR4 2933 ECC LRDIMM 288-pin CL21 1.2V 4Rx4 kit for Dell PowerEdge R840 R940xa

SKU CH-XBAA-4402R

512GB kit of four 128GB DDR4 2933 ECC load-reduced DIMMs for Dell PowerEdge R840 and R940xa servers

  • Capacity512GB (4 x 128GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 512GB (4 x 128GB)

Struck-through versions exist but are not stocked here.

  • 512 GB total capacity across four 128 GB modules
  • DDR4 2933 MHz speed with CL21 latency for responsive server workloads
  • ECC load-reduced design protects data integrity in critical applications
  • 2 V operation reduces power draw in dense configurations
  • Validated for Dell PowerEdge R840 and R940xa platforms

Server-grade ECC LRDIMM kit for Dell PowerEdge

This OWC kit delivers 512GB of DDR4 2933 ECC Load-Reduced memory across four 128GB modules. It is built for Dell PowerEdge R840 and R940xa servers that require registered ECC LRDIMM technology. The modules operate at 1.2V with CL21 latency and a 4Rx4 rank structure. This memory will not work in standard desktops or systems that use unbuffered or registered ECC DIMMs.

Straightforward DIMM installation

The 288-pin LRDIMMs install like any server DIMM: power down, open the chassis, align the key notch, and press until the ejectors latch. The critical rule is that Load-Reduced modules cannot be mixed with unbuffered or registered ECC DIMMs in the same system. Population order follows the Dell service manual for the R840 and R940xa; deviating from that order will prevent the server from posting.

Verify your server model

Confirm the chassis is a Dell PowerEdge R840 or R940xa, as this kit is validated only for those platforms. Check that existing DIMMs are also DDR4 ECC Load-Reduced; mixing with other ECC types is not supported. The modules are backward compatible with 2133, 2400 and 2666MHz bus speeds, so they will clock down if the CPU or firmware dictates a lower rate. Ensure enough free DIMM slots exist for the four-module kit.

Highlights

  • 512 GB total capacity across four 128 GB modules
  • DDR4 2933 MHz speed with CL21 latency for responsive server workloads
  • ECC load-reduced design protects data integrity in critical applications
  • 2 V operation reduces power draw in dense configurations
  • Validated for Dell PowerEdge R840 and R940xa platforms

Specifications

BrandOWC
Part Number2L9D44R4512S
Capacity512GB (4 x 128GB)
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Heat SpreaderNo
Compatible SystemDell PowerEdge R840
Dell PowerEdge R940xa

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

How can I verify the 512GB kit is running at the rated 2933MHz CL21 after installation?

Enter the server BIOS or use a tool like CPU-Z to confirm the memory reports DDR4-2933, CAS latency 21, 1.2V and ECC Load Reduced operation across all four 128GB modules.

What does the OWC 512GB kit contain and is anything else required?

The box holds four 128GB DDR4 2933 PC4-23400 CL21 4Rx4 288-pin 1.2V ECC Load Reduced LRDIMMs; no extra cables, brackets or software are needed for Dell PowerEdge R840 or R940xa.

Why choose the 512GB (4×128GB) DDR4-2933 ECC LRDIMM kit over other capacities?

This kit delivers the full 512GB using four 128GB Load Reduced modules optimised for R840 and R940xa, running at 2933MHz with backward compatibility to 2133, 2400 and 2666MHz.

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