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Four green 288-pin DDR4 RDIMM modules in static bags

NEMIX RAM

NEMIX RAM 128GB (4x32GB) DDR4 2666MHz ECC RDIMM CL19 1.2V Synology Compatible memory upgrade

SKU CH-VC0N-8VFXA

A 128 GB kit of four 32 GB DDR4 2666 ECC registered DIMMs validated for Synology NAS systems

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 128 GB total capacity from four 32 GB modules
  • DDR4 2666 MHz speed rated at PC4-21300
  • ECC registered RDIMM protects data integrity
  • Low 1.2 V operating voltage reduces power draw
  • CL19 CAS latency for responsive server workloads

Synology DDR4 ECC RDIMM Kit

This NEMIX RAM kit delivers 128GB of DDR4 2666MHz ECC registered memory across four 32GB modules. It is built for Synology NAS systems that require 288-pin RDIMM modules with CL19 timing and 1.2V operation.

For Synology NAS owners needing maximum capacity

Suits administrators expanding a compatible Synology unit to 128GB with validated ECC registered DIMMs. Not for desktop PCs, laptops, or workstations that require unbuffered UDIMM memory or non-ECC modules. Buyers whose systems only accept UDIMM or SO-DIMM form factors should look elsewhere.

Simple DIMM installation with standard precautions

The 288-pin RDIMMs install in minutes by seating each module firmly until the retention clips lock. ECC registered memory requires a motherboard or NAS chassis that explicitly supports registered DIMMs; installing these in a board that only accepts unbuffered memory will prevent boot. Always verify the Synology model qualification list before purchase.

How it compares

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

Price $734.99
Pricier than about 57% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $5.74 per GB
Cheaper than about 68% 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 numberMR21300-324K4
Total capacity128 GB (4 × 32 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 rank2Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items128 GB (4 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What Synology NAS models are confirmed to work with this 128GB DDR4 2666MHz ECC RDIMM kit?

This kit is built for Synology systems that accept DDR4 2666 ECC registered DIMMs; check your NAS manual for the exact qualified model list.

Can I mix these 2Rx4 registered modules with existing unbuffered DDR4 DIMMs in the same Synology unit?

No, registered ECC RDIMMs cannot be combined with unbuffered memory; all slots must use matching registered modules.

How do I verify the full 128GB is recognised and ECC is active after installation?

Open the Synology DSM interface, go to Info Center and confirm 128GB total with ECC status shown as enabled.

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