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Green circuit board with black memory chips and gold edge connector

OWC

OWC 128GB DDR4 2933MHz CL21 4Rx4 ECC LRDIMM 1.2V 288-pin server RAM

SKU CH-WCMH-EVA7W

Single 128 GB DDR4-2933 ECC LRDIMM with CL21 latency, 4Rx4 organisation and 1.2 V operation for servers, workstations and NAS systems

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

Capacity 128GB

  • 128GB single-module capacity enables maximum density per slot
  • ECC load-reduced design maintains data integrity under heavy server workloads
  • 2933MHz DDR4 speed with CL21 latency delivers responsive performance
  • 2V operation reduces power draw across large memory deployments
  • Backward compatible with 2133MHz, 2400MHz and 2666MHz systems

Server Capacity & Purpose

This single 128GB DDR4 ECC LRDIMM module targets servers, workstations and NAS systems that require registered load-reduced memory. It will not work in standard desktop computers and cannot be mixed with unbuffered modules. The 288-pin form factor fits compatible DDR4 slots in enterprise platforms.

Build Integration

The module operates at 1.2V and conforms to JEDEC PC4-23400 specifications for 2933MHz speed with CL21 latency. Backward compatibility allows installation in systems rated for 2133MHz, 2400MHz or 2666MHz. No heat spreader is fitted, freeing vertical clearance in dense multi-DIMM configurations.

Sustained Operation

ECC load-reduced architecture reduces electrical load on the memory controller during continuous multi-rank access, supporting data integrity over long workloads. The 4Rx4 organisation distributes traffic across four ranks per channel. JEDEC and RoHS compliance ensures stable voltage regulation without thermal throttling under sustained throughput.

Highlights

  • 128GB single-module capacity enables maximum density per slot
  • ECC load-reduced design maintains data integrity under heavy server workloads
  • 2933MHz DDR4 speed with CL21 latency delivers responsive performance
  • 2V operation reduces power draw across large memory deployments
  • Backward compatible with 2133MHz, 2400MHz and 2666MHz systems

Specifications

BrandOWC
Part Number2L9D44R4128G
Capacity128GB
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2933 (PC4 23400)
CAS LatencyCL21
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Heat SpreaderNo

Other versions of this model

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

Questions about this item

Does the 2933MHz CL21 timing limit throughput before the 128GB capacity fills?

The module runs at 2933MHz with CL21 latency; bandwidth scales with the memory controller, not the 128GB density.

How much heat does a 1.2V 4Rx4 LRDIMM produce under continuous load?

Operating at 1.2V without a heat spreader, the load-reduced design keeps thermals within standard server airflow limits.

Must the motherboard support 4Rx4 ECC LRDIMM and 288-pin DDR4 slots to use this module?

Yes — the board needs DDR4 288-pin slots that accept 4Rx4 ECC load-reduced DIMMs; standard unbuffered slots will not work.

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