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Four green DDR4 ECC SODIMM sticks, 260-pin, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (4×16GB) DDR4 2666 ECC SODIMM Synology DS3617xsII memory upgrade

SKU CH-2CQE-9DVDB

A 64 GB kit of four 16 GB DDR4 2666 ECC unbuffered SODIMM modules for Synology DS3617xsII NAS

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 64 GB total capacity for demanding NAS workloads
  • Four 16 GB modules populate all slots
  • DDR4 2666 speed with CL19 latency
  • ECC unbuffered design protects data integrity
  • 20 V operation reduces power draw

Synology DS3617xsII 64GB ECC kit

This 64GB kit contains four 16GB DDR4 2666 ECC unbuffered SODIMM modules built for the Synology DiskStation DS3617xsII. Each stick runs at 1.2V with CL19 timing and a 2Rx8 organisation. The ECC design helps protect data integrity in a NAS that runs continuous workloads.

Verify four free SODIMM slots

Before ordering confirm that your DS3617xsII has four available 260-pin SODIMM slots and that the system BIOS accepts DDR4 2666 ECC unbuffered memory at 1.2V. The modules are sold as a matched 4×16GB kit so installing them together avoids mixed-rank or mixed-speed issues. Check the Synology hardware guide for the exact slot population order.

Adds 64GB to a NAS without extra power or cooling

The kit plugs directly into the existing SODIMM sockets and draws standard 1.2V DDR4 power so no additional power connectors or cooling changes are required. Adding 64GB frees the system from memory pressure during heavy file serving virtualization or container tasks. The unbuffered ECC design keeps the signal path simple while still providing error correction for critical data.

How it compares

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

Price $478.99
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 $7.48 per GB
Cheaper than about 54% 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 Unbuffered SODIMM
Part numberMSE21300-628K4
Total capacity64 GB (4 × 16 GB)
Product type260-PIN DDR4 ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items64 GB (4 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM KIT

Questions about this item

Does the kit include all four 16 GB modules or must any be purchased separately?

The kit ships as a single package containing four 16 GB modules, giving 64 GB total with nothing else to buy.

Why choose the 64 GB (4×16 GB) kit instead of a smaller capacity?

It fills all four slots of the DS3617xsII with matched 16 GB sticks, delivering the maximum supported 64 GB in one validated kit.

What does the 2666 MT/s rating mean once the modules are installed in the DS3617xsII?

The memory will run at DDR4 2666 (PC4-21300) with CL19 latency at 1.2 V, providing the rated ECC unbuffered performance for the NAS.

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