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Green circuit board with black memory chips and gold edge connector

Synology Inc.

Synology Inc. D4EU01-16G 16GB DDR4 ECC UDIMM

SKU CH-CTEQ-MKXGE MPN D4EU01-16G

16GB DDR4 ECC unbuffered UDIMM memory module for Synology FlashStation FS2500 12-bay NAS

  • TypeAccessory
  • FeaturesRAM DDR4 ECC Unbuffered UDIMM 16GB

Option D4EU01-16G

Struck-through versions exist but are not stocked here.

  • 16 GB capacity lets the FlashStation FS2500 handle larger workloads
  • ECC protection detects and corrects single-bit memory errors
  • Unbuffered DDR4 UDIMM installs directly in the 288-pin slots
  • Low 1.2 V operation reduces power draw and heat
  • Single 16 GB module simplifies future expansion

Synology FS2500 16GB DDR4 ECC UDIMM

This 16GB DDR4 ECC unbuffered UDIMM is designed specifically for the Synology FlashStation FS2500 12-bay NAS enclosure. It operates at 1.2V using a standard 288-pin form factor. The module adds error-correcting memory to protect data integrity in a critical storage appliance.

Upgrade path for FS2500 memory expansion

The module installs directly into the FS2500 to increase total system memory beyond the factory configuration. Adding this capacity is worthwhile when the NAS handles heavier workloads such as virtualisation, many concurrent users, or large deduplication tables. It is not suited for any other Synology model or generic desktop platform.

16GB single-module capacity and limits

A single 16GB stick provides substantial headroom for the FS2500 to cache metadata and run multiple services simultaneously. The unbuffered design keeps latency low for the supported platform. Systems requiring more than the maximum supported memory per slot or total chassis capacity will need additional modules or a different hardware tier.

Highlights

  • 16 GB capacity lets the FlashStation FS2500 handle larger workloads
  • ECC protection detects and corrects single-bit memory errors
  • Unbuffered DDR4 UDIMM installs directly in the 288-pin slots
  • Low 1.2 V operation reduces power draw and heat
  • Single 16 GB module simplifies future expansion

Specifications

BrandSynology
ModelD4EU01-16G
TypeAccessory
FeaturesRAM DDR4 ECC Unbuffered UDIMM 16GB
Shipping weight0.05 kg
Package size185 × 91 × 10 mm

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Will the 288-pin DDR4 UDIMM fit the FlashStation FS2500 memory slots?

Yes, the 288-pin DDR4 UDIMM form factor matches the FlashStation FS2500 slots exactly.

Do I need to install the ECC UDIMM in a specific slot order on the FS2500?

Insert the module into the lowest-numbered empty slot first; the common error is skipping a slot and leaving a gap.

When should I consider adding another 16GB module to the FS2500?

Add a second 16GB DDR4 ECC UDIMM when workloads exceed the current 16GB capacity or to enable dual-channel operation.

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