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Four green DDR4 LRDIMM modules with gold contacts, no heat spreaders

OWC

OWC 256GB (4x64GB) DDR4 2666MHz CL19 ECC LRDIMM 1.2V 288-pin Server RAM

SKU CH-K4WK-ZG69N

A 256GB quad-channel kit of four 64GB DDR4 2666MHz CL19 ECC load-reduced DIMMs for servers and workstations

  • Capacity256GB (4 x 64GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 256GB (4 x 64GB)

  • ECC load-reduced design protects data integrity in servers
  • 256GB total capacity across four 64GB modules for heavy workloads
  • DDR4 2666MHz CL19 speed meets PC4-21300 standard
  • 2V operation reduces power draw in dense configurations
  • Backward compatible with 2133MHz and 2400MHz systems

Server Memory Kit

This OWC kit provides 256GB of DDR4 ECC LRDIMM memory across four 64GB modules. It is built for servers, workstations and NAS systems that require registered load-reduced modules. The memory operates at 2666MHz with a CL19 latency and 1.2V voltage. Standard desktop computers cannot use this memory type.

288-Pin Load-Reduced Design

Each module uses a 288-pin LRDIMM form factor with 4Rx4 organisation and ECC error correction. The load-reduced buffer reduces electrical load on the memory controller, allowing higher density per channel. No heat spreader is fitted, so airflow in the chassis must handle cooling. The kit is a dual-channel set and cannot be mixed with unbuffered DIMMs.

Capacity Upgrade Path

The kit replaces lower-density DDR4 LRDIMM sets or fills empty slots to reach 256GB total capacity. It is backward compatible with 2133MHz and 2400MHz bus speeds, so it can step into older DDR4 platforms without configuration changes. The jump is worthwhile when virtualisation, large databases or memory-bound workloads exceed the current installed capacity.

Privalumai

  • ECC load-reduced design protects data integrity in servers
  • 256GB total capacity across four 64GB modules for heavy workloads
  • DDR4 2666MHz CL19 speed meets PC4-21300 standard
  • 2V operation reduces power draw in dense configurations
  • Backward compatible with 2133MHz and 2400MHz systems

Specifikacijos

BrandOWC
Part Number2L6D44R4256S
Capacity256GB (4 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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What speed does the DDR4 2666MHz PC4-21300 interface actually run at in a system that only supports 2400MHz?

The modules are backward compatible and will operate at 2400MHz when installed in a system limited to that speed, while retaining ECC load-reduced functionality.

What physical slot and clearance does the 288-pin LRDIMM require?

Each 64GB module uses a standard 288-pin DDR4 LRDIMM form factor with no heat spreader, so it fits any server or workstation DIMM slot wired for load-reduced memory.

How are the four modules installed for dual-channel operation, and what mistake should be avoided?

Populate the four DIMMs across the two memory channels as specified by the server motherboard manual; the common error is placing all modules in a single channel or mixing them with unbuffered DIMMs.

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