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Green rectangular circuit board with gold edge connectors and black memory chips, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC RDIMM CL19 1.2V 288-pin Synology FS3400 memory upgrade

SKU CH-BTSG-PXXMG

Adds 16 GB of DDR4 2666 ECC registered memory to a Synology FS3400 NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • ECC protection prevents data corruption in the Synology FS3400
  • Registered RDIMM design supports stable server operation under load
  • 16 GB capacity expands NAS memory for heavier workloads
  • DDR4 2666 speed matches the system’s rated frequency
  • Low 1.2 V voltage reduces power draw and heat

Synology FS3400 NAS memory upgrade

This 16 GB DDR4 2666 MHz ECC registered DIMM is validated for the Synology FlashStation FS3400. It targets IT teams who need to expand memory capacity in that specific NAS platform without compatibility risk.

288-pin registered module with major OEM chips

The stick uses Samsung, Micron or Hynix components on a standard 288-pin RDIMM PCB. Registered buffering and ECC protect data integrity under sustained workloads, while 1.2 V operation keeps power draw low. No heat spreader is fitted, so airflow in the chassis handles cooling.

Replaces or adds to factory memory in the FS3400

Adding this module increases total system memory for virtualisation, caching or multi-user file services. The upgrade is worth it when the NAS shows memory pressure during peak loads or when new services require more RAM than the original configuration provides.

How it compares

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

Price $99.99
Cheaper than about 68% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.25 per GB
Cheaper than about 63% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-614K1
Total capacity16 GB
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Will the DDR4 2666 PC4-21300 registered ECC module run at its rated speed in a Synology FS3400?

Yes, the module is built to the DDR4 2666 PC4-21300 specification and is validated for the Synology FlashStation FS3400, so it will operate at 2666 MT/s with ECC and registered signalling active.

Does the 288-pin RDIMM fit the memory slots in a Synology FS3400 without a riser or adapter?

The 288-pin DDR4 RDIMM form factor matches the FS3400 DIMM sockets directly; no riser, adapter or special bracket is required.

What is the correct orientation when seating the 1Rx4 ECC RDIMM in the FS3400 slot?

Align the notch on the module with the key in the slot, press down evenly until both retention clips click, and verify the module sits flush — partial seating is the most common error.

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