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

OWC

OWC 16GB DDR4 2666 PC4-21300 CL19 2Rx8 288-pin 1.2V ECC Unbuffered DIMM memory upgrade

SKU CH-SR02-6RBJ0

Adds 16 GB of DDR4 ECC UDIMM memory at 2666 MHz CL19 for compatible Synology NAS systems

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16 GB capacity expands NAS memory for larger workloads
  • DDR4 2666 speed with CL19 latency delivers responsive performance
  • ECC unbuffered design protects data integrity in Synology systems
  • 2 V operation reduces power draw and heat output
  • Compatible with SA3400D, DS725+, DS925+, DS1825+ and DS1825xs+

OWC 16GB DDR4 2666 ECC DIMM for Synology NAS

This 16GB DDR4 2666 PC4-21300 CL19 ECC unbuffered DIMM is a single 288-pin module designed as a warranty-safe upgrade for specific Synology NAS systems. It runs at 1.2V with a 2Rx8 rank configuration and meets JEDEC and RoHS standards.

Suits owners of compatible Synology models needing

It fits the SA3400D, DS1825+, DS1825xs+, DS725+ and DS925+. Builders requiring non-ECC memory, registered DIMMs, speeds above 2666MHz or capacities beyond 16GB per module should look elsewhere.

One module adds 16GB of error-correcting capacity

The CL19 timing at 2666MHz handles typical NAS workloads such as file serving, virtualization and multi-user access. Backward compatibility with 2133MHz and 2400MHz systems provides headroom for mixed-speed configurations.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $118.99
Cheaper than about 65% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.44 per GB
Cheaper than about 55% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2E6D42R816 GB
Total capacity16 GB
Product type288-Pin DDR4 ECC UDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Memory rank2Rx8
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology NAS SA3400D
Synology DiskStation DS1825+
Synology DiskStation DS1825xs+
Synology DiskStation DS725+
Synology DiskStation DS925+

Other versions of this model

5 more in the same range

Questions about this item

Which Synology NAS models must I already own for this 16GB DDR4 2666 ECC UDIMM to be a supported upgrade?

The module is validated for the Synology SA3400D, DS1825+, DS1825xs+, DS725+ and DS925+ systems.

How will this CL19 2666MHz stick behave if I keep existing 2133MHz or 2400MHz modules in the same NAS?

It is backward compatible with 2133MHz and 2400MHz speeds, so the system will run all modules at the lowest common frequency.

After installation, how can I confirm the 288-pin ECC unbuffered DIMM is recognised and running at PC4-21300?

Check the Synology DSM info centre; it will show 16GB capacity, 2666MHz speed, ECC active and 1.2V voltage for the new module.

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