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OWC

OWC 64GB (4x16GB) DDR4 2666 ECC Registered RDIMM Server Memory

SKU CH-8DJK-6VFFE

Kit of four 16 GB DDR4 2666 MHz ECC registered RDIMMs totalling 64 GB for servers and NAS systems

  • Capacity64GB (4 x 16GB)
  • Type288-Pin DDR4 SDRAM
  • SpeedDDR4 2666 (PC4 21300)
  • CAS LatencyCL19
  • Voltage1.2V
  • ECCYes

Capacity 64GB (4 x 16GB)

Rank 2Rx4

  • ECC registered design protects data integrity in servers and workstations
  • 64GB kit with four 16GB modules expands memory capacity for demanding workloads
  • DDR4 2666 speed with CL19 latency delivers responsive performance for NAS and server applications
  • JEDEC and RoHS compliant modules ensure warranty-safe upgrades for Synology RackStation RS18017xs+
  • 2V low-voltage operation reduces power draw while maintaining stability

Server ECC RDIMM Kit

This 64GB kit contains four 16GB DDR4 2666 registered DIMMs built for Synology RackStation RS18017xs+ and compatible NAS or workstation platforms. The modules carry CL19 timing at 1.2V and use a 2Rx4 organisation. They are not compatible with standard desktop computers or with unbuffered or load-reduced memory.

ECC Registered Function

Error-correcting code and register buffering let the system detect and correct single-bit errors while reducing electrical load on the memory controller. This combination improves data integrity for always-on workloads such as virtualisation, database services and multi-user file shares.

DDR4 2666 Interface Limit

The kit runs at PC4-21300 speed and will down-clock to 2400MHz or 2133MHz when the platform requires it. It cannot operate in consumer desktop chipsets that lack registered-DIMM support, and it cannot be mixed with unbuffered or LRDIMM modules.

Highlights

  • ECC registered design protects data integrity in servers and workstations
  • 64GB kit with four 16GB modules expands memory capacity for demanding workloads
  • DDR4 2666 speed with CL19 latency delivers responsive performance for NAS and server applications
  • JEDEC and RoHS compliant modules ensure warranty-safe upgrades for Synology RackStation RS18017xs+
  • 2V low-voltage operation reduces power draw while maintaining stability

Specifications

BrandOWC
Part Number2R6D42R4064S
Capacity64GB (4 x 16GB)
Type288-Pin DDR4 SDRAM
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

Will any of the four 16 GB modules need replacement under normal server workloads?

The kit uses JEDEC-standard DDR4 2666 registered ECC DIMMs rated at 1.2 V with CL19 latency; no scheduled replacement is required during the system's service life.

What limit appears first when the memory runs continuously at 2666 MHz in a Synology RACKSTATION RS18017xs+?

The registered buffer and 2Rx4 organisation keep electrical loading within the platform's DIMM-per-channel limit, so capacity ceiling is reached before signal-integrity margins are exceeded.

How much extra heat or power draw should I expect from the 64 GB kit running all day in a NAS?

Four 1.2 V DDR4 2666 registered modules add only modest heat; the absence of heat spreaders means airflow from the chassis fans is sufficient for sustained operation.

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