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Two green 288-pin DDR4 LRDIMM sticks, bare chips, no heat spreader

OWC

OWC 64GB (2x32GB) DDR4 2666MHz CL19 ECC Load Reduced LRDIMM 1.2V 288-pin Server RAM

SKU CH-14WJ-XCAB2

A 64GB dual-channel kit of DDR4 2666MHz ECC load-reduced LRDIMMs for servers, workstations and NAS systems

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeLoad Reduced
  • Memory rank4Rx4

Capacity 64GB (2 x 32GB)

  • ECC protection keeps data accurate with 4Rx4 load-reduced design
  • 64 GB dual-channel kit delivers 32 GB per module for server workloads
  • DDR4 2666 speed at CL19 latency runs on 1.2 V for efficient operation
  • 288-pin LRDIMM form factor fits server, workstation and NAS platforms
  • Backward compatible with 2133 MHz and 2400 MHz systems for flexible deployment

Server ECC LRDIMM Kit

This OWC kit provides 64GB of DDR4 server memory in a dual-channel pair of 32GB modules. It is designed for workstations, servers and NAS systems that require error-correcting load-reduced DIMMs. The modules operate at 1.2V and carry a CL19 latency rating.

Load-Reduced 4Rx4 Architecture

The defining specification is the 4Rx4 load-reduced design with ECC. This architecture reduces electrical load on the memory controller, allowing higher total capacity per channel than standard registered DIMMs. It will not work in desktop boards and cannot be mixed with unbuffered memory.

288-Pin DDR4 Compatibility

Each module uses the 288-pin DDR4 form factor and is backward compatible with 2133MHz and 2400MHz bus speeds. The kit frees two DIMM slots for the full 64GB capacity and requires a platform that explicitly supports DDR4 ECC LRDIMM memory.

How it compares

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

Price $397.99
Pricier than about 66% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (2 × 32 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.22 per GB
Cheaper than about 61% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameOWC
Part number2L6D44R4064P
Total capacity64 GB (2 × 32 GB)
Product type288-Pin DDR4 ECC LRDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeLoad Reduced
Memory rank4Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

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Questions about this item

How does 64GB of DDR4 2666MHz ECC LRDIMM perform in a real server?

The kit delivers 64GB total capacity across two 32GB modules running at 2666MHz with CL19 latency, providing error correction and load-reduced buffering for stable operation in compatible servers and workstations.

What does the PC4-21300 DDR4 2666MHz interface cap in practice?

The DDR4 2666MHz (PC4-21300) interface supports data rates up to 2666MT/s and is backward compatible with 2400MHz and 2133MHz systems, operating at the highest speed the platform allows.

What does the 288-pin LRDIMM form factor need to fit in a server?

Each 288-pin DDR4 LRDIMM module requires a DDR4 LRDIMM-compatible DIMM slot on a server, workstation, or NAS motherboard; it will not fit standard desktop UDIMM slots.

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