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Two green DDR4 UDIMM sticks, no heat spreaders, gold contacts visible

NEMIX RAM

NEMIX RAM 16GB (2x8GB) DDR4 2666MHz ECC Unbuffered UDIMM CL19 1.2V 288-Pin Synology Compatible Memory Upgrade

SKU CH-0YD5-K7CD5

A 16 GB DDR4 2666 MHz ECC unbuffered UDIMM kit with CL19 latency and 1.2 V operation for Synology NAS upgrades

  • Total capacity16 GB (2 × 8 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection guards data integrity with built-in error correction
  • 2666 MHz DDR4 speed handles demanding NAS workloads
  • 2 V operation reduces power draw and heat output
  • 16 GB dual-channel kit expands Synology capacity instantly
  • Major OEM chips ensure stable 24/7 operation

Synology NAS Memory Kit

This NEMIX RAM kit provides 16GB of DDR4 ECC unbuffered memory in a matched pair of 8GB modules. It is built for Synology NAS units that require 2666MHz PC4-21300 UDIMMs with CL19 timing and 1.2V operation.

Fits 288-Pin DDR4 Slots

The modules install directly into standard 288-pin DDR4 DIMM sockets on compatible Synology motherboards. ECC functionality works with platforms that support error-correcting unbuffered memory, leaving other slots free for further expansion if the chassis allows.

Tested Module Assurance

Each stick is stress-tested under load using major OEM DRAM from Samsung, Micron or Hynix before shipping. The kit arrives as a validated 2x8GB pair so the NAS can run in dual-channel mode without the user sourcing and matching individual modules.

How it compares

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

Price $98.99
Cheaper than about 68% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB (2 × 8 GB)
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.19 per GB
Cheaper than about 63% 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 UDIMM
Part numberME21300-818K2
Total capacity16 GB (2 × 8 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 rank1Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (2 × 8 GB) DDR4 2400 MHz PC4-19200 1Rx8 1.2 V CL19 288-PIN ECC Unbuffered UDIMM KIT

Questions about this item

What is the CAS latency of these DDR4 2666 modules?

The kit runs at CL19 latency, which is the standard timing for DDR4 2666 ECC unbuffered memory.

How much heat will these modules produce without a heat spreader during continuous operation?

They operate at the standard 1.20 V DDR4 voltage, so thermal output matches typical unbuffered ECC UDIMMs and relies on chassis airflow for cooling.

Which Synology NAS models are confirmed compatible with this 288-pin ECC UDIMM kit?

The kit is validated for Synology systems that accept DDR4 2666 ECC unbuffered UDIMMs, such as those using the D4EC-2666-8G part number.

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