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Green circuit board with black memory chips, gold edge connector, rectangular SODIMM shape

A-Tech

A-Tech 16GB DDR4 2666MHz ECC SODIMM CL19 1.20V 2Rx8 260-Pin

SKU CH-6G5F-8SZ8W

16 GB DDR4 2666 MHz ECC SODIMM module with CL19 latency and 1.20 V operation for compatible Synology NAS systems

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forAMD & Intel Compatible
  • ECC protection guards data integrity on critical NAS workloads
  • 16 GB capacity expands multitasking headroom for demanding applications
  • DDR4 2666 MHz speed delivers responsive throughput for Synology systems
  • CL19 latency at 1.20 V balances performance with efficient power draw
  • Validated compatibility across DS, RS and DVA series platforms

16GB DDR4 ECC SODIMM for Synology NAS

This 16GB DDR4 2666MHz ECC unbuffered SODIMM upgrades compatible Synology DiskStation, RackStation, FlashStation and NVR DVA units. It targets administrators who need error-correcting memory for data integrity in always-on storage appliances. The single 260-pin module installs in supported bays to expand capacity for virtualization, containers or heavy multi-user workloads.

Standard voltage and tested reliability

Operating at 1.20V, the module runs at the DDR4 standard voltage without elevated power draw. All units undergo quality assurance testing to verify dependable performance under continuous NAS operation. The unbuffered ECC design adds error correction while keeping latency at CL19 for typical file-service and backup workloads.

Replaces Synology D4ECSO-2666-16G and D4ES01-16G

This module serves as a direct equivalent for the listed Synology part numbers across models such as DS1522+, DS1621+, DS1821+, DS2422+, DS923+, DS723+, RS822+, RS1221+ and DVA3221. The upgrade is worthwhile when the system reports memory pressure during concurrent services or when adding virtual machines. Builders needing non-ECC memory or speeds above 2666MHz should look elsewhere.

How it compares

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

Price $139.99
Pricier than about 69% of the 2,079 comparable items (median $70.99).
Total capacity 16 GB
Typical for this category: the median of 1,886 items is 16 GB.
Price per GB $8.75 per GB
Pricier than about 74% of the 1,886 comparable items (median $5.94 per GB).

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Specifications

Product
Brand nameA-Tech
Total capacity16 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Power
Rated voltage1.2 V
Compatibility
Recommended forAMD & Intel Compatible

Questions about this item

How do I install this 260-pin DDR4 SODIMM in my Synology DS923+ and what step is often missed?

Power off the NAS, unplug it, open the chassis, align the notch on the 260-pin module with the slot key, press firmly until the side clips click, then reapply power and verify the new 16GB capacity in DSM.

What maintenance or replacement will this ECC unbuffered module need over time?

No scheduled maintenance is required; keep the NAS vents clear so the module stays at its 1.20V operating temperature, and replace only if DSM reports a correctable ECC error count that exceeds the system threshold.

What limit appears first when this CL19 2666MHz module runs sustained workloads on a DS1621+?

The memory controller caps throughput at the DDR4 2666 PC4-21300 data rate, so sustained bandwidth tops out at that ceiling before thermal throttling or voltage limits become factors.

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