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Two green 288-pin DDR4 LRDIMM sticks, no heat spreaders

OWC

OWC 128GB (2x64GB) DDR4 2666MHz PC4-21300 CL19 4RX4 ECC LRDIMM 1.2V 288-pin Server RAM

SKU CH-Z38D-RBG3Q

A 128GB dual-channel DDR4 2666 ECC LRDIMM kit for servers, workstations and NAS systems

  • Capacity128GB (2 x 64GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 128GB (2 x 64GB)

  • 128 GB total capacity from two 64 GB modules
  • DDR4 2666 MHz speed with CL19 latency
  • ECC Load Reduced design for server error correction
  • 2 V operation reduces power draw
  • Backward compatible with 2133 MHz and 2400 MHz systems

128GB DDR4 ECC LRDIMM kit

This OWC kit delivers 128GB of DDR4 server memory in two 64GB modules running at 2666MHz with CL19 latency. The load-reduced ECC design targets workstations, servers and NAS systems that require registered, error-correcting modules. It operates at the standard 1.2V and uses the 288-pin DDR4 form factor.

JEDEC compliance and backward speeds

The modules meet JEDEC PC4-21300 specifications and are ROHS compliant, making them a warranty-safe upgrade for qualified platforms. They also run at 2133MHz and 2400MHz when installed in systems that only support those lower speeds. No heat spreaders are fitted, so airflow clearance follows the bare module profile.

For ECC LRDIMM platforms only

This memory suits administrators upgrading or populating servers, workstations or NAS units that specifically accept DDR4 ECC load-reduced DIMMs. It will not work in standard desktop boards, consumer laptops or any system that requires unbuffered non-ECC modules, and it cannot be mixed with unbuffered memory.

Highlights

  • 128 GB total capacity from two 64 GB modules
  • DDR4 2666 MHz speed with CL19 latency
  • ECC Load Reduced design for server error correction
  • 2 V operation reduces power draw
  • Backward compatible with 2133 MHz and 2400 MHz systems

Specifications

BrandOWC
Part Number2L6D44R4128P
Capacity128GB (2 x 64GB)
Type288-Pin DDR4 ECC LRDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredLoad Reduced
Rank4Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Questions about this item

Will the ECC LRDIMM modules need replacement after a certain number of operating hours?

The modules are built to JEDEC DDR4 standards with ECC error correction and a limited lifetime warranty, so no scheduled replacement interval applies under normal server workloads.

What limits sustained throughput when the 4Rx4 LRDIMMs run continuously at 2666 MT/s?

The CL19 latency and 1.2 V JEDEC voltage ceiling define the bandwidth ceiling; the memory controller cannot push past the rated PC4-21300 data rate without violating spec.

How much heat and power do the two 64 GB LRDIMMs generate during all-day server operation?

Each module operates at the standard DDR4 1.2 V, and the load-reduced buffer reduces electrical load on the bus, keeping thermals within typical server DIMM limits without a heat spreader.

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