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Green 288-pin DDR4 ECC UDIMM memory module, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC UDIMM CL19 1.2V 2Rx8 Synology RS3618xs memory upgrade

SKU CH-X9GH-744R8

16 GB DDR4 2666 ECC UDIMM with CL19 latency and 1.2 V operation for Synology RS3618xs NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection prevents data corruption in critical NAS workloads
  • 16 GB module expands RS3618xs capacity for demanding applications
  • DDR4 2666 speed matches system specifications for stable operation
  • Low 1.20 V voltage reduces power draw and heat output
  • 2Rx8 dual-rank organisation maximises memory density per slot

Synology RS3618xs 16GB DDR4 ECC UDIMM

This NEMIX RAM module is a 16GB DDR4 2666 ECC UDIMM built specifically for the Synology RackStation RS3618xs NAS. It operates at 1.2V with CL19 latency and uses a 2Rx8 rank configuration on a 288-pin unbuffered PCB. The part number is ME21300-628K1.

Suits owners expanding a Synology RS3618xs

Buyers who need registered or load-reduced DIMMs cannot use this unbuffered module. Systems that require a different DDR generation, a non-ECC stick, or a capacity other than 16GB per slot should look elsewhere.

Single 16GB DDR4 2666 CL19 1.2V ECC UDIMM

The decisive spec is the 2Rx8 288-pin unbuffered ECC UDIMM form factor matched to the Synology RS3618xs qualified vendor list. If the NAS calls for this exact configuration the module will install and run without compatibility issues.

How it compares

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

Price $140.99
Cheaper than about 63% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $8.81 per GB
Typical for this category: the median of 20,941 items is $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 Unbuffered UDIMM
Part numberME21300-628K1
Total capacity16 GB
Product type288-Pin DDR4 ECC UDIMM
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 items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 288-PIN ECC Unbuffered UDIMM

Questions about this item

What does the DDR4 2666 rating mean once the module is installed in the Synology RS3618xs?

The module operates at 2666 MT/s with CL19 latency, delivering the rated PC4-21300 bandwidth when the system runs the memory at its specified speed.

How does the 288-pin ECC UDIMM interface limit performance in this NAS?

The 288-pin DDR4 ECC unbuffered DIMM slot caps transfer rates to the DDR4 2666 standard and provides single-bit error correction without registered buffering overhead.

What physical space and power does the 2Rx8 stick need inside the RS3618xs?

It fits a standard 288-pin DDR4 UDIMM slot, draws 1.2 V, has no heat spreader, and uses a dual-rank 2Rx8 chip layout that matches the system's memory architecture.

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