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Green rectangular DDR4 RDIMM module with gold edge contacts and black chips, no heat spreader

OWC

OWC 16GB DDR4 2666 ECC Registered RDIMM for Synology D4RD-2666-16G SA3400 SA410 SA3600 SA3610 server RAM

SKU CH-A1SW-VTJNW

16 GB DDR4 2666 ECC registered RDIMM for Synology SA3400, SA410, SA3600 and SA3610 NAS servers

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank2Rx4

Capacity 16GB

Rank 2Rx4

  • ECC registered design protects data integrity in Synology NAS servers
  • 16GB single module expands memory capacity for SA3400, SA410, SA3600, SA3610 systems
  • DDR4 2666MHz CL19 speed matches OEM specifications for reliable performance
  • JEDEC and RoHS compliant construction ensures warranty-safe upgrade path
  • Backward compatible with 2133MHz and 2400MHz platforms for flexible deployment

ECC Registered RDIMM for Synology NAS

This 16GB DDR4 2666 module is an ECC registered RDIMM designed for Synology FlashStation SA3400, SA410, SA3600 and SA3610 servers. It operates at 1.2V with CL19 latency and uses a 2Rx4 rank configuration on a 288-pin form factor. The module is JEDEC-standard and RoHS compliant.

Not for desktop or unbuffered systems

This memory will not work in standard desktop computers and cannot be mixed with unbuffered or load-reduced ECC modules. Buyers who need non-ECC or unbuffered DIMMs for consumer motherboards should look elsewhere. It is intended strictly for compatible server, workstation and NAS platforms that support registered ECC DDR4.

Steady throughput under sustained load

Registered buffering and ECC correction maintain data integrity during continuous multi-threaded workloads typical of NAS and virtualization tasks. Backward compatibility with 2133MHz and 2400MHz systems allows deployment in mixed-speed environments without timing instability. The single 16GB rank layout helps keep latency predictable during extended operations.

How it compares

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

Price $108.99
Cheaper than about 66% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $6.81 per GB
Cheaper than about 55% 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 number2R6D42R416 GB
Total capacity16 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Other versions of this model

5 more in the same range

Questions about this item

Which Synology NAS models accept this 288-pin DDR4 2666 ECC RDIMM?

This module is validated for the SA3400, SA410, SA3600 and SA3610 FlashStation systems.

Can I keep my existing 2133 MHz or 2400 MHz DDR4 ECC registered DIMMs and add this 2666 MHz stick?

Yes — the module is backward compatible with 2133 MHz and 2400 MHz ECC registered memory, so it will run at the lower speed alongside them.

How do I confirm the 16 GB module is recognised at 2666 MHz with ECC active after installation?

Check the NAS memory information page; it should show 16 GB, DDR4 2666, CL19, 1.2 V, ECC registered, 2Rx4.

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