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Two green 288-pin DDR4 LRDIMM modules with black chips, no heat spreader

OWC

OWC 128GB (2x64GB) DDR4 2933MHz CL21 4Rx4 ECC LRDIMM 1.2V 288-pin server RAM

SKU CH-J6EX-QXKNM

A 128 GB dual-channel kit of DDR4-2933 ECC LRDIMM modules for server and workstation upgrades

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latencyCL21
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 128GB (2 x 64GB)

  • ECC load-reduced design prevents data errors in servers
  • 128 GB dual-channel kit doubles bandwidth for heavy workloads
  • DDR4 2933 MHz CL21 speed matches modern platform specs
  • 2 V operation reduces power draw per module
  • Backward compatible with 2133, 2400 and 2666 MHz systems

Server-grade ECC LRDIMM kit

This OWC kit provides 128GB of DDR4 memory in two 64GB modules rated at 2933MHz with CL21 latency. It uses load-reduced ECC technology designed for servers, workstations and NAS systems. The modules operate at 1.2V and conform to JEDEC standard specifications. They are not compatible with standard desktop computers or unbuffered memory configurations.

Sustained-load behaviour

Load-reduced architecture reduces electrical load on the memory controller, helping maintain signal integrity when all slots are populated under continuous demand. ECC circuitry detects and corrects single-bit errors during extended operation, protecting data integrity in critical workloads. The dual-channel kit supports backward compatibility with 2133MHz, 2400MHz and 2666MHz platforms.

Pre-order checks

Verify that your motherboard and CPU support DDR4 ECC LRDIMM modules and 4Rx4 rank configuration. Confirm the platform accepts 288-pin load-reduced DIMMs and can utilise the full 128GB capacity across two channels. Ensure you are not mixing these modules with unbuffered or non-ECC memory, as this will prevent boot or cause instability.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $859.99
Pricier than about 79% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $6.72 per GB
Cheaper than about 56% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2L9D44R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latencyCL21
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

How much power does the 1.2V DDR4 2933MHz LRDIMM draw when the server runs continuously?

Each 64 GB module operates at 1.2 V, the standard DDR4 voltage, so total kit power stays within normal server memory limits for 128 GB of ECC Load-Reduced DIMMs.

What motherboard features are required to use these 288-pin 4Rx4 ECC Load-Reduced DIMMs?

The board must provide DDR4 288-pin slots that support ECC Load-Reduced registered memory; standard desktop boards with unbuffered slots will not work.

Will the 2933 MHz CL21 kit run stably in a system that currently uses 2400 MHz DDR4 ECC LRDIMMs?

Yes, the modules are backward compatible with 2133, 2400 and 2666 MHz speeds and will down-clock to match the slower memory already installed.

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