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Green circuit board with black memory chips, gold edge connector, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC UDIMM 1.2V CL19 288-Pin Synology Compatible memory upgrade

SKU CH-857K-9PK2R

16GB DDR4 2666 ECC UDIMM module validated for Synology NAS reliability

  • 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 Synology NAS
  • 16 GB capacity expands memory for heavy workloads
  • 2666 MHz DDR4 speed matches system specifications
  • 2 V low voltage reduces power consumption
  • 288-pin UDIMM fits standard Synology memory slots

Synology NAS memory upgrade

This 16 GB DDR4 2666 ECC UDIMM is built for Synology RackStation NAS units that require error-correcting unbuffered memory. It installs in a standard 288-pin DIMM slot and operates at 1.2 V with a CL19 latency profile. The module targets administrators who need to expand capacity in a supported Synology platform.

Thermals noise and power draw

The stick runs at the standard DDR4 voltage of 1.20 V and carries no heat spreader, so it relies on the NAS chassis airflow for cooling. ECC operation adds minimal overhead while protecting data integrity during continuous workloads. Power consumption stays within the normal envelope for a single 16 GB unbuffered module.

What the bundle changes

The package contains only the single 16 GB UDIMM itself; no additional cables, brackets or software utilities are included. Compatibility is validated for the listed Synology systems, so the module can be installed without firmware adjustments. The lifetime replacement warranty covers the memory against defects for the usable life of the product.

How it compares

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

Price $135.99
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 $8.50 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 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

How do I install the 288-pin DDR4 ECC UDIMM in my Synology RackStation, and what step is often missed?

Power off the NAS, open the chassis, align the notch on the 288-pin module with the slot key, press firmly until the retention clips click, then verify the new 16GB capacity in DSM before closing the case.

What maintenance or replacement will the 16GB DDR4 2666 ECC module need over time?

The unbuffered ECC UDIMM has no moving parts or heat spreader, so no routine maintenance is required; replacement is only needed if a memory error appears or capacity must be increased.

What limit appears first when the 2Rx8 CL19 1.2V module runs under sustained load?

The CL19 latency at 2666 MT/s sets the throughput ceiling, and the fixed 1.20 V supply prevents any frequency headroom during prolonged workloads.

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