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Four green DDR4 RDIMM modules with gold contacts, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR4 2666 ECC RDIMM 1Rx4 CL19 288-Pin Synology SA3400 memory upgrade

SKU CH-ZMD4-7J9YW

A 64 GB kit of four 16 GB DDR4 2666 ECC registered DIMMs with CL19 latency for Synology SA3400 NAS

  • Total capacity64 GB (4 × 16 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 Synology SA3400 NAS
  • Registered DDR4 2666 modules deliver 64 GB across four 16 GB DIMMs
  • CL19 latency at 1.20 V balances speed with server stability
  • 288-pin RDIMM form factor installs directly in compatible Synology bays
  • Built with Samsung Micron Hynix chips for enterprise-grade reliability

Synology SA3400 memory kit

This 64 GB kit contains four 16 GB DDR4 2666 ECC registered DIMMs built for the Synology SA3400 NAS. Each module runs at 1.2 V with CL19 latency and a 1Rx4 organisation. The registered design adds a buffer that helps maintain signal integrity on the server motherboard.

Compatibility and slot check

Verify that your SA3400 has four free 288-pin DDR4 slots and that the system firmware supports registered ECC memory at this speed. The modules are not interchangeable with unbuffered or non-ECC DIMMs used in desktop boards. Mixing registered and unbuffered memory will prevent the system from booting.

Build quality and daily handling

Samsung, Micron or Hynix chips are used throughout the kit and every module is stress tested under load before shipping. The bare green PCB has no heat spreader, so keep airflow over the slots clear during operation. Handle the modules by the edges only and seat them firmly until the retention clips click.

How it compares

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

Price $379.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.94 per GB
Cheaper than about 66% of the 20,941 comparable items (median $8.19 per GB).

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-614K4
Total capacity64 GB (4 × 16 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 items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the 64GB kit contain four 16GB modules or do I need to buy additional DIMMs?

The kit ships as four 16GB DDR4 2666 ECC RDIMM modules for a total of 64GB, so no extra DIMMs are required.

Should I choose the 1Rx4 CL19 registered version or a different rank and latency for my Synology SA3400?

The SA3400 is validated with 1Rx4 CL19 registered modules at 2666 MT/s; this exact configuration matches the vendor qualification list.

What does the 2666 MT/s rating mean once the memory is installed in the SA3400?

The NAS memory controller will run the kit at its rated 2666 MT/s, delivering PC4-21300 bandwidth with ECC error correction for data integrity.

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