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Green 288-pin DDR4 RDIMM module without heat spreader

NEMIX RAM

NEMIX RAM 32GB DDR4 2666 CL19 ECC RDIMM Synology SA3400 memory upgrade

SKU CH-DEVR-ZF2KY

32 GB DDR4 2666 ECC registered RDIMM built for Synology SA3400 NAS expansion

  • Total capacity32 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 32 GB module doubles Synology SA3400 memory capacity
  • ECC registered design protects data integrity under load
  • DDR4 2666 CL19 timing matches factory specifications
  • 2 V operation keeps power draw low
  • 288-pin RDIMM form factor fits the NAS slot

Synology SA3400 ECC RDIMM Upgrade

This NEMIX RAM module adds 32GB of DDR4 2666 ECC registered memory to a Synology SA3400 NAS. It arrives as a single 288-pin RDIMM rated at 1.2V with CL19 latency and a 2Rx4 rank configuration. The part number MR21300-324K1 confirms factory validation for the target platform.

IT Teams Maintaining SA3400 Units

The module suits administrators who need to expand the memory of a Synology SA3400 for virtualisation, file services or database workloads that benefit from error-correcting registered DIMMs. It is not intended for consumer desktops, laptops or unbuffered UDIMM slots, and it cannot be used in systems that require non-ECC or load-reduced memory.

32GB Single-DIMM Capacity Limit

The decisive specification is the 32GB capacity delivered on one RDIMM, which determines the maximum memory per slot on the SA3400. If the chassis has multiple slots, each can accept an identical module, but a single stick cannot exceed this density. Buyers must verify the platform's total slot count and maximum supported memory before ordering.

How it compares

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

Price $198.99
Cheaper than about 59% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $6.22 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 numberMR21300-324K1
Total capacity32 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 items32 GB (1 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Will the 288-pin DDR4 RDIMM fit the memory slots in my Synology SA3400?

Yes, the module is a 288-pin DDR4 RDIMM designed specifically for the Synology SA3400 NAS, so it matches the slot keying and electrical requirements of that system.

What is the correct way to seat the registered ECC module, and what step do people often miss?

Power down the NAS, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until both retention clips click, then verify in DSM that the full 32 GB is recognised at 2666 MHz with ECC active.

When should I expect to replace this 32 GB ECC RDIMM in a 24/7 NAS workload?

The module uses major OEM Samsung, Micron or Hynix chips rated for continuous server operation; under normal thermal conditions it typically lasts the life of the NAS, and ECC will correct single-bit errors before they affect data integrity.

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