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Green circuit board with black chips and gold edge connector

Synology Inc.

Synology D4RD-2666-16G 16 GB DDR4 2666 MHz ECC Registered DIMM 288-pin 1.2 V

SKU CH-RFCM-YBD30 MPN D4RD-2666-16G

16 GB DDR4 ECC registered DIMM running at 2666 MHz, 1.2 V, 288-pin, validated for FS3400, FS6400 and SA3400 NAS servers

  • TypeAccessory
  • FeaturesApplied Models: FS6400, FS3400, SA3400

Option D4RD-2666-16G

Struck-through versions exist but are not stocked here.

  • ECC protection safeguards data integrity on compatible NAS
  • 2666 MHz DDR4 speed supports demanding workloads
  • 16 GB capacity expands memory for FS6400, FS3400, SA3400
  • Registered signal processing improves system stability
  • 2 V operation reduces power consumption

Synology 16 GB DDR4-2666 ECC RDIMM

This 16 GB DDR4 module runs at 2666 MHz with ECC and registered signal processing. It is designed for Synology NAS servers that require registered DIMMs. The 1.2 V operating voltage matches the platform specification. Compatible models include the FS6400, FS3400 and SA3400.

Registered ECC with 288-pin interface

The single specification that decides fit is the registered ECC design on a 288-pin DIMM. Unbuffered or non-ECC modules will not work in the target systems. The 2666 MHz speed and 1.2 V voltage are fixed by the platform. No other memory type is supported by the listed appliances.

Fits FS6400, FS3400 and SA3400 NAS units

This module installs directly into the memory slots of the supported Synology NAS models. It adds 16 GB of error-correcting capacity per slot without requiring changes to the chassis or power supply. Builders who need unbuffered memory or a different form factor cannot use this part.

Highlights

  • ECC protection safeguards data integrity on compatible NAS
  • 2666 MHz DDR4 speed supports demanding workloads
  • 16 GB capacity expands memory for FS6400, FS3400, SA3400
  • Registered signal processing improves system stability
  • 2 V operation reduces power consumption

Specifications

BrandSynology
ModelD4RD-2666-16G
TypeAccessory
FeaturesApplied Models: FS6400, FS3400, SA3400
Shipping weight0.01 kg
Package size184 × 93 × 13 mm

Other versions of this model

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Questions about this item

How much usable capacity does the 16 GB module add to a compatible NAS?

The module provides 16 GB of DDR4 memory, expanding the total system memory by that amount when installed in a supported unit.

What does the 2666 MHz rating mean for actual data throughput in the NAS?

The memory runs at 2666 MHz DDR4, setting the maximum clock speed for data transfers between the CPU and this DIMM in the FS6400, FS3400 or SA3400.

Will the 288-pin registered DIMM fit the memory slots in my Synology NAS?

Yes, the 288-pin registered DIMM form factor matches the slots on the FS6400, FS3400 and SA3400 models listed for this module.

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