Synology 16GB DDR4-2666 ECC UDIMM NAS Memory (D4EC-2666-16G) – PC4-21300

The Synology 16GB DDR4-2666 ECC UDIMM NAS module is designed for network attached storage systems. Its ECC design helps keep data accurate under continuous load. Speed is rated at 2666 MT/s. It is built for Compatible Synology NAS models (check Synology’s compatibility list).

More memory for a more capable NAS.

More Memory for Your NAS Workloads

A NAS running many users, containers, virtual machines or caching runs short of memory quickly, which slows file access and background tasks.

This 16GB DDR4 ECC UDIMM module adds capacity for file services, apps and virtualisation on compatible Synology NAS systems.

Specifications That Match Your System

Key specs: DDR4, 2666 MT/s, PC4-21300, 288-pin, UDIMM, 1.2V. Match the memory type, form factor and speed your system supports.

Error Correction and Stability

ECC memory corrects single-bit errors automatically, which helps prevent crashes and silent data corruption in systems that run around the clock.

Setup Instructions

How to Install the Memory

1. Shut down the NAS from its management interface and unplug the power cable.
2. Open the memory slot cover as described in the NAS hardware guide.
3. Insert the module, aligning the notch, until it clicks into place.
4. Close the cover, power on and confirm the new memory size in the NAS system information.