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Green circuit board with gold contacts and black memory chips, 288-pin DDR4 LRDIMM module

OWC

OWC 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Load Reduced LRDIMM memory upgrade

SKU CH-KSW8-V34QW

Single 128GB DDR4 2933 ECC Load-Reduced DIMM for PowerEdge C4140 servers

  • Capacity128GB
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2933 (PC4 23400)
  • CAS LatencyCL21
  • Voltage1.2V
  • ECCYes

Capacity 128GB

Show 4 more configurations
  • 128 GB single-module capacity maximises server memory density
  • ECC load-reduced design maintains data integrity under heavy workloads
  • DDR4 2933 MHz CL21 speed matches qualified platform specifications
  • 2 V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server DDR4 LRDIMM Upgrade

This 128GB OWC module is a DDR4 2933 PC4-23400 CL21 ECC Load Reduced DIMM built for server and workstation platforms. It uses a 288-pin form factor and operates at 1.2V with an 8Rx4 rank configuration. The part is validated for the PowerEdge C4140 with CascadeLake CPUs and is not compatible with standard desktop computers.

Capacity and Headroom

A single stick delivers 128GB of registered ECC memory, providing substantial headroom for virtualisation, large databases and memory-intensive compute tasks. The LRDIMM architecture reduces electrical load on the memory bus, allowing higher total system capacity than standard RDIMMs. Systems limited to lower-density modules or unbuffered memory cannot use this module.

Load Reduced ECC Requirement

The module requires a platform that supports DDR4 ECC Load Reduced technology; it cannot be mixed with unbuffered or standard registered ECC DIMMs. JEDEC and RoHS compliance ensures a warranty-safe upgrade. Backward compatibility covers 2133MHz, 2400MHz and 2666MHz bus speeds, but the controlling factor remains the LRDIMM memory controller.

Highlights

  • 128 GB single-module capacity maximises server memory density
  • ECC load-reduced design maintains data integrity under heavy workloads
  • DDR4 2933 MHz CL21 speed matches qualified platform specifications
  • 2 V operation reduces power draw in dense configurations
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Specifications

BrandOWC
Part Number2L9D48R4128G
Capacity128GB
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank8Rx4
Heat SpreaderNo
Compatible SystemPowerEdge C4140 (CascadeLake CPU)

Other versions of this model

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Questions about this item

Will this 288-pin DDR4 2933 LRDIMM run with my existing 2400 MHz modules in a PowerEdge C4140?

The module is backward compatible with 2133 MHz, 2400 MHz and 2666 MHz speeds, but LRDIMM cannot be mixed with unbuffered or registered ECC memory, so all slots must use load-reduced modules.

How can I confirm the 128 GB stick is detected at CL21 after installation?

Enter the server BIOS or use a tool like ipmitool to verify the DIMM shows 128 GB, 2933 MT/s, CL21 timings and ECC load-reduced status with no correctable errors reported.

Does the single 128 GB LRDIMM ship with a heat spreader or any extra brackets?

The module has no heat spreader and no additional brackets are included; only the 288-pin DDR4 ECC LRDIMM itself is in the box.

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