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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

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

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.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $383.99
Pricier than about 65% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $6.00 per GB
Cheaper than about 64% of the 6,064 comparable items (median $7.25 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameOWC
Part number2R6D42R4064S
Total capacity64 GB (4 × 16 GB)
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Kit configurationDual Channel Kit
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

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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