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Two green 288-pin DDR4 RDIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 32GB (2x16GB) DDR4 2666 ECC RDIMM Synology FS6400

SKU CH-WVGG-E783Z

A 32 GB dual-rank ECC registered DDR4-2666 kit validated for the Synology FS6400

  • Capacity32GB (2 x 16GB)
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 32 GB capacity handles demanding NAS workloads
  • ECC registered design protects data integrity under load
  • DDR4 2666 speed matches FS6400 specifications
  • 2 V operation reduces power draw and heat
  • 1Rx4 organisation optimises density for two-slot upgrade

Synology FS6400 DDR4 2666 ECC kit

This 32GB kit contains two 16GB registered DIMMs built for the Synology FlashStation FS6400 NAS. The modules run at DDR4 2666 with CL19 latency and include on-die error correction for data integrity in storage workloads.

Registered 288-pin RDIMM layout

Each stick uses a 1Rx4 organisation and operates at 1.20V without a heat spreader, fitting the standard server DIMM slots on the FS6400 motherboard. The registered buffer reduces electrical load on the memory controller when both slots are populated.

32GB capacity limit per kit

The package delivers exactly 32GB across two modules, matching the validated configuration for this NAS model. Builders who need more memory must verify the FS6400 maximum supported capacity before adding additional kits.

Highlights

  • 32 GB capacity handles demanding NAS workloads
  • ECC registered design protects data integrity under load
  • DDR4 2666 speed matches FS6400 specifications
  • 2 V operation reduces power draw and heat
  • 1Rx4 organisation optimises density for two-slot upgrade

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC RDIMM Registered Server Memory
Part NumberMR21300-614K2
Capacity32GB (2 x 16GB)
SpeedDDR4 2666 (PC4 21300)
ECCYes
Buffered/RegisteredRegistered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemSynology
CAS LatencyCL19
Heat SpreaderNo
Type288-Pin DDR4 RDIMM
Rank1Rx4
FeaturesDDR4 ECC Registered RDIMM Server Motherboard Compatible
Package Content32GB (2X16GB) DDR4 2666MHZ PC4-21300 1Rx4 1.2V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What DDR4 standard and speed does this kit run at, and what bandwidth does that cap?

The kit runs at DDR4 2666 (PC4-21300), so peak transfer is capped at 21300 MB/s.

What physical slot and form factor must the Synology FS6400 provide for these modules?

The FS6400 needs free 288-pin DDR4 RDIMM slots; each module is a standard-height registered DIMM with no heat spreader.

How are the modules installed, and what step is often missed?

Power off the NAS, open the chassis, align the notch on each 288-pin RDIMM, press firmly until the latches click, then verify in DSM that both 16 GB modules are recognised at 2666 MHz with ECC active.

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