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Four green 288-pin DDR4 RDIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM 128GB (4×32GB) DDR4 2666 PC4-21300 CL19 ECC RDIMM memory upgrade

SKU CH-QMRD-5Z939

A 128 GB DDR4 2666 ECC registered kit of four 32 GB modules validated for Synology FlashStation FS6400 NAS

  • 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 for demanding workloads
  • ECC registered design protects data integrity
  • 2666 MHz DDR4 speed matches system specs
  • 2 V operation reduces power draw
  • 288-pin RDIMM form factor fits Synology FS6400

Synology FlashStation FS6400 NAS Kit

This 128GB kit contains four 32GB DDR4 2666 ECC RDIMM modules validated for the Synology FlashStation FS6400 NAS. It is built for administrators who need registered, error-correcting memory to keep a production storage appliance stable under load. The kit is not suited for desktop PCs or consumer motherboards that require unbuffered DIMMs.

Registered ECC DDR4 2666 PC4-21300

The modules run at 2666 MT/s with CL19 latency at 1.20V and present a 2Rx4 organisation to the memory controller. Registered buffering and ECC are mandatory for the target platform; systems that only accept unbuffered non-ECC DDR4 cannot use this kit. No higher speeds or lower latencies are specified for this part.

288-Pin 2Rx4 1.2V RDIMM Form Factor

Each stick is a 288-pin DDR4 RDIMM with a 2Rx4 rank structure, the single specification that determines whether the memory will post in the FlashStation FS6400. Buyers must verify that their chassis and firmware support 32GB 2Rx4 registered modules before purchasing.

How it compares

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

Price $783.99
Pricier than about 58% 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 $6.12 per GB
Cheaper than about 64% 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

Should I pick the 128 GB kit or a smaller capacity for my Synology FS6400?

The 128 GB kit provides four 32 GB modules; choose it if your FS6400 has four free slots and you need maximum capacity, otherwise select a smaller kit that matches the slots you can fill.

What does the 2666 MHz rating actually deliver inside the NAS?

The modules run at 2666 MT/s with CL19 timing, giving the rated PC4-21300 bandwidth when the FS6400 memory controller operates at its native DDR4 2666 speed.

How does the DDR4 RDIMM ECC interface limit performance in this system?

The 288-pin registered DDR4 ECC interface caps the kit at 2666 MT/s and CL19, so the FS6400 cannot run the memory faster than its supported DDR4 2666 standard.

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