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Two green circuit boards with gold edge connectors and black memory chips, no heat spreaders

OWC

OWC 128GB (2x64GB) DDR4 2400MHz CL17 4Rx4 ECC LRDIMM 1.2V 288-pin Server RAM

SKU CH-CA83-WZJR7

128 GB dual-channel DDR4 2400 MHz ECC load-reduced server kit with CL17 latency and 1.2 V operation

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR4 2400 (PC4 19200)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 128GB (2 x 64GB)

  • ECC load-reduced design protects data integrity in servers
  • 128GB dual-channel kit maximises memory capacity for demanding workloads
  • DDR4 2400MHz CL17 speed balances throughput and latency
  • 2V operation reduces power draw in dense configurations
  • Backward compatible with 2133MHz systems for flexible deployment

Capacity and configuration

This kit provides 128 GB of DDR4 server memory in a matched pair of 64 GB modules. Each stick is a 288-pin LRDIMM running at 2400 MHz with CL17 latency and 1.2 V operation. The load-reduced design and on-die ECC are built for multi-socket platforms that require registered, error-correcting memory.

Suitable systems and mismatched needs

The modules are validated for server, workstation and NAS platforms that accept DDR4 LRDIMMs. They will not work in standard desktop PCs or consumer laptops that only support unbuffered non-ECC DIMMs. Buyers needing memory for a regular desktop motherboard should look elsewhere.

Deciding specification

The load-reduced ECC LRDIMM form factor is the single attribute that determines fit; the memory must be installed in a system whose memory controller and BIOS explicitly support DDR4 LRDIMM modules.

How it compares

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

Price $724.99
Pricier than about 76% 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 $5.66 per GB
Cheaper than about 67% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2L4D44R4128P
Total capacity128 GB (2 × 64 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2400 (PC4 19200)
Memory
CAS latencyCL17
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

Does the 288-pin DDR4 LRDIMM fit a standard server DIMM slot?

Yes, the modules use the 288-pin DDR4 LRDIMM form factor required by compatible server and workstation boards.

What is the correct installation sequence for the dual-channel 2 x 64 GB kit?

Install one module in each channel — typically slot 1 and slot 3 — so the memory controller sees a matched pair.

When should the ECC LRDIMMs be replaced in a 24/7 server?

Replace them if the system logs correctable ECC errors that climb steadily or if the modules fail a full memory diagnostic.

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