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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

  • Capacity32GB (2 x 16GB)
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 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.

Highlights

  • 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

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC Unbuffered SODIMM
Part NumberMSE21300-628K2
Capacity32GB (2 x 16GB)
SpeedDDR4 2666 (PC4 21300)
ECCYes
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemSynology
CAS LatencyCL19
Heat SpreaderNo
Type260-PIN DDR4 ECC SODIMM
Rank2Rx8
FeaturesDDR4 ECC Unbuffered SODIMM Motherboard Compatible
Package Content32GB (2X16GB) DDR4 2666MHZ PC4-21300 2Rx8 1.2V CL19 260-PIN ECC Unbuffered SODIMM KIT

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