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Two green SODIMM modules with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 32GB (2x16GB) DDR4 2666 ECC Unbuffered SODIMM CL19 1.2V 260-PIN memory upgrade

SKU CH-4C91-XMAXF

A 32 GB DDR4 ECC SODIMM kit for Synology NAS, running at 2666 MT/s with CL19 latency and 1.2 V operation

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC guards data integrity for Synology DS3617xsII
  • Dual-rank 2Rx8 organisation boosts memory throughput
  • 32 GB kit (2 × 16 GB) doubles factory capacity
  • 2 V DDR4 runs cool in compact NAS bays
  • 260-pin SODIMM fits straight into Synology slots

Capacity and fit

This kit provides 32 GB of DDR4 2666 memory in two 16 GB SODIMM modules. It is built for Synology DiskStation DS3617xsII systems that accept 260-pin ECC unbuffered memory. The 2Rx8 organisation and CL19 timing match the platform requirements listed by the supplier.

Sustained-load behaviour

Modules are stress-tested under load to verify stability during continuous operation. ECC circuitry detects and corrects single-bit errors that can accumulate in long-running NAS workloads. The 1.20 V operating voltage keeps power draw consistent while the dual-rank layout supports steady throughput.

Pre-order checks

Confirm that your Synology unit uses DDR4 SODIMM slots and supports ECC unbuffered modules before ordering. Verify the maximum memory capacity per slot and the total number of available slots in the specific model. Ensure the system BIOS or firmware recognises 2Rx8 modules at 2666 MT/s.

How it compares

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

Price $248.99
Cheaper than about 56% of the 21,161 comparable items (median $397.99).
Total capacity 32 GB (2 × 16 GB)
Typical for this category: the median of 20,941 items is 32 GB.
Price per GB $7.78 per GB
Typical for this category: the median of 20,941 items is $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 numberMSE21300-628K2
Total capacity32 GB (2 × 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 items32 GB (2 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM KIT

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