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

OWC

OWC 256GB (2x128GB) DDR4 2666MHz CL19 ECC Load Reduced LRDIMM 1.2V 288-pin Server RAM

SKU CH-TYSK-SSB5R

Dual-channel 256GB DDR4 ECC LRDIMM kit running at 2666MHz CL19 for servers, workstations and NAS systems

  • Capacity256GB (2 x 128GB)
  • Type288-Pin DDR4 ECC LRDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 256GB (2 x 128GB)

  • ECC error correction protects data integrity in critical workloads
  • Load-reduced design lowers electrical load for high-density server configurations
  • 2666MHz DDR4 speed with CL19 latency delivers responsive throughput
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment
  • 256GB dual-channel kit (2×128GB) maximises memory capacity per slot

Server-grade ECC LRDIMM kit

This OWC kit provides 256GB of DDR4 ECC load-reduced memory across two 128GB modules. It runs at 2666MHz with CL19 latency and 1.2V operation. The 288-pin LRDIMM form factor is built for servers, workstations and NAS systems that require registered ECC memory with 4Rx4 organisation.

For multi-socket servers needing maximum capacity

The dual-channel kit suits administrators upgrading older DDR4 platforms that support load-reduced DIMMs and 128GB per slot. It will not work in standard desktop boards, consumer laptops or any system that only accepts unbuffered non-ECC modules. Buyers who need unbuffered ECC or standard UDIMMs should look elsewhere.

Straightforward installation in compatible slots

Modules insert into 288-pin DDR4 DIMM sockets like any registered DIMM; no heat spreader means clearance is rarely an issue. The kit is backward compatible with 2133MHz and 2400MHz bus speeds. The most common issue is attempting to mix these LRDIMMs with unbuffered memory or installing them in a board that does not support load-reduced topology.

Highlights

  • ECC error correction protects data integrity in critical workloads
  • Load-reduced design lowers electrical load for high-density server configurations
  • 2666MHz DDR4 speed with CL19 latency delivers responsive throughput
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment
  • 256GB dual-channel kit (2×128GB) maximises memory capacity per slot

Specifications

BrandOWC
Part Number2L6D44R4256P
Capacity256GB (2 x 128GB)
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

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What type of server or workstation motherboard is required for these 288-pin DDR4 ECC LRDIMM modules?

The modules need a DDR4 server or workstation board that supports 288-pin ECC load-reduced DIMMs at 1.2 V; they will not work in standard desktop motherboards or with unbuffered memory.

Can the 2666 MHz CL19 LRDIMMs run alongside existing 2133 MHz or 2400 MHz DDR4 ECC memory in the same system?

Yes, the kit is backward compatible with 2133 MHz and 2400 MHz DDR4 ECC LRDIMM modules, though the system will operate all memory at the lowest common speed.

How can I confirm the full 256 GB kit is recognised and running at 2666 MHz with ECC active after installation?

Check the BIOS or UEFI memory information screen — it should show 256 GB total, 2666 MT/s data rate, CL19 timings and ECC enabled for each 128 GB module.

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