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Eight green DDR4 RDIMM modules in anti-static tray

OWC

OWC 256GB (8x32GB) DDR4 2666MHz CL19 ECC Registered RDIMM 1.2V 288-pin Server RAM

SKU CH-K7NV-PHQE8

Eight 32 GB DDR4 2666 MHz CL19 ECC registered RDIMMs totalling 256 GB for servers and workstations

  • Capacity256GB (8 x 32GB)
  • Type288-Pin DDR4 ECC RDIMM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 256GB (8 x 32GB)

Show 7 more configurations

Rank 2Rx4

  • ECC protection prevents data corruption in critical server workloads
  • Registered design stabilises signals for reliable 256GB capacity across eight modules
  • 2666MHz speed with CL19 latency delivers responsive performance for virtualisation
  • 2V operation reduces power draw and heat in dense configurations
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment

Server Memory Kit

This OWC kit provides 256GB of DDR4 ECC Registered RDIMM memory across eight 32GB modules. It is built for servers, workstations and NAS systems that require error-correcting registered memory. The modules run at 2666MHz with CL19 latency at 1.2V. Standard desktop computers cannot use this memory and it must not be mixed with unbuffered modules.

Sustained Load Behaviour

Registered modules place less electrical load on the memory controller, helping stability when all 256GB are populated during long compute or virtualisation workloads. ECC corrects single-bit errors on the fly, reducing the risk of silent data corruption over extended uptime. The 1.2V operation keeps power draw consistent across the full kit. Backward compatibility with 2133MHz and 2400MHz systems allows the modules to down-clock automatically if the platform requires it.

Pre-Order Checks

Verify that your motherboard and CPU support DDR4 ECC Registered RDIMMs and can address 256GB across eight 288-pin slots. Confirm the platform accepts 2Rx4 rank organisation and that the BIOS is current enough to initialise the full capacity. Ensure no unbuffered DIMMs are already installed, as mixing memory types is not supported. This kit is not compatible with standard desktop or consumer laptop platforms.

Highlights

  • ECC protection prevents data corruption in critical server workloads
  • Registered design stabilises signals for reliable 256GB capacity across eight modules
  • 2666MHz speed with CL19 latency delivers responsive performance for virtualisation
  • 2V operation reduces power draw and heat in dense configurations
  • Backward compatible with 2133MHz and 2400MHz systems for flexible deployment

Specifications

BrandOWC
Part Number2R6D42R4256K
Capacity256GB (8 x 32GB)
Type288-Pin DDR4 ECC RDIMM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Multi-channel KitDual Channel Kit
Heat SpreaderNo

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Questions about this item

How much power does the 1.2V DDR4 2666MHz kit draw when the server runs continuously?

Each module operates at 1.2V, the standard DDR4 voltage, so total power scales with the eight 32GB sticks installed.

What motherboard feature must my system already have to use these 288-pin ECC registered RDIMMs?

The board needs DDR4 slots that support ECC registered memory; standard desktop platforms that only accept unbuffered DIMMs will not work.

Will these CL19 2666MHz modules run stably alongside my existing 2133MHz DDR4 ECC sticks?

Yes, the kit is backward compatible with 2133MHz and 2400MHz speeds, so it will down-clock to match the slower modules.

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