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Green circuit board SODIMM module with black memory chips, no heat spreader

OWC

OWC 16GB DDR4 2666MHz CL19 ECC SODIMM for Synology DS3617xs DS3617xsII memory upgrade

SKU CH-GZEK-VHD94

16 GB DDR4 2666 MHz ECC SODIMM adds error-correcting memory to Synology DS3617xs and DS3617xsII NAS systems

  • Total capacity16 GB (1 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Memory rank2Rx8
  • 16GB ECC SODIMM adds reliable capacity for Synology DS3617xs and DS3617xsII
  • DDR4 2666MHz CL19 speed matches system specs for stable throughput
  • 2V low-voltage operation reduces power draw and heat in the NAS
  • JEDEC and RoHS compliant module ensures warranty-safe upgrade path
  • Backward compatible with 2400MHz and 2133MHz systems for flexible deployment

16GB DDR4 ECC SODIMM for Synology DS3617xs Series

This 16GB DDR4 2666MHz ECC SODIMM is built for Synology DiskStation DS3617xs and DS3617xsII NAS units. It targets administrators who need to expand memory in these specific micro server platforms. The module delivers error-correcting code protection for data integrity in always-on environments.

Capacity and headroom for NAS workloads

The single 16GB module runs at 2666MHz with CL19 latency and 1.2V operation. It handles multi-user file serving, virtualization hosts and container workloads that benefit from ECC protection. Capacity runs out when concurrent VMs or large deduplication tables exceed the physical slot limit of the chassis.

JEDEC-compliant unbuffered design

The 260-pin SODIMM uses a 2Rx8 unbuffered layout without a heat spreader, fitting the tight drive-bay clearance of the target DiskStation models. Backward compatibility with 2400MHz and 2133MHz buses allows deployment in mixed-speed configurations. The JEDEC-standard build ensures warranty-safe installation.

How it compares

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

Price $115.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (1 × 16 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $7.25 per GB
Cheaper than about 56% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2C6D42R816 GB
Total capacity16 GB (1 × 16 GB)
Product type260-Pin DDR4 ECC SODIMM
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 DiskStationDS3617xs
Synology DiskStationDS3617xsII

Questions about this item

Will this 2666MHz DDR4 SODIMM run reliably alongside the 2400MHz modules already in my DS3617xs?

Yes, the module is backwards compatible with 2400MHz and 2133MHz speeds, so it will downclock automatically to match your existing memory.

How can I verify the 16GB ECC SODIMM is recognised correctly after installation?

Open DSM, go to Control Panel > Info Center > System, and confirm the total memory shows the added 16GB with ECC status reported as active.

Does the package contain only the single 260-pin 16GB stick or are screws or tools included?

Only the 16GB DDR4 2666MHz CL19 ECC SODIMM is supplied; no screws, tools or additional components are included.

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