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Green circuit board with black memory chips and gold edge connectors

OWC

OWC 32GB DDR4 2666 ECC Registered RDIMM CL19 1.2V 2Rx4

SKU CH-5418-NV55K

32 GB DDR4 2666 ECC registered RDIMM for servers and Synology NAS, CL19 1.2 V 2Rx4 single module

  • Capacity32GB
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 32GB

Rank 2Rx4

  • ECC registered design protects data integrity in servers
  • 32GB capacity expands memory for demanding workloads
  • DDR4 2666MHz speed matches PC4-21300 system specs
  • 2V operation reduces power draw under load
  • Backward compatible with 2133MHz and 2400MHz platforms

OWC 32GB DDR4 2666 ECC Registered RDIMM

This 32GB DDR4 2666 MHz module is an ECC Registered RDIMM built for servers, workstations and compatible NAS systems such as the Synology FlashStation FS2017. It operates at 1.2V with CL19 latency and a 2Rx4 rank configuration. The 288-pin design follows JEDEC standards and is not suitable for standard desktop computers or unbuffered memory slots.

Sustained load behaviour with ECC registered design

The registered buffer reduces electrical load on the memory controller, allowing stable operation when all slots are populated under continuous workloads. ECC circuitry detects and corrects single-bit errors in real time, preventing data corruption during long-running tasks. Backward compatibility with 2133 MHz and 2400 MHz systems lets the module downclock automatically without losing error-correction benefits.

Installation notes for registered DIMM slots

Install only in motherboards that explicitly support DDR4 ECC Registered memory; mixing with unbuffered or load-reduced modules will prevent boot. Align the key notch on the 288-pin edge connector with the slot and press firmly until the retention clips engage. No heat spreader is fitted, so ensure adequate chassis airflow over the bare PCB for sustained reliability.

Points forts

  • ECC registered design protects data integrity in servers
  • 32GB capacity expands memory for demanding workloads
  • DDR4 2666MHz speed matches PC4-21300 system specs
  • 2V operation reduces power draw under load
  • Backward compatible with 2133MHz and 2400MHz platforms

Caractéristiques

BrandOWC
Part Number2R6D42R432GB
Capacity32GB
Type288-Pin DDR4 SDRAM
SpeedDDR4 2666 (PC4 21300)
CAS LatencyCL19
Voltage1.2V
ECCYes
Buffered/RegisteredRegistered
Rank2Rx4
Heat SpreaderNo

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Questions sur cet article

Does the 1.2 V DDR4 module run cooler than older memory when the NAS is under load all day?

The module operates at 1.2 V, which is the standard DDR4 voltage and lower than previous DDR generations, so sustained workloads generate less heat inside a crowded NAS chassis.

My Synology FS2017 has four DIMM slots — do I need to fill them all for this 32 GB stick to work?

No, the Registered DIMM works in a single slot; the FS2017 supports single-module operation, so you can add just one 32 GB stick.

Can I keep my existing 2133 MHz DDR4 ECC Registered sticks and add this 2666 MHz module?

Yes, the module is backward compatible with 2133 MHz and 2400 MHz speeds, so it will down-clock to match the slower sticks you already have.

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