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Two green 260-pin DDR4 SODIMM modules without heat spreaders

NEMIX RAM

NEMIX RAM 32GB (2x16GB) DDR4 2666 ECC SODIMM Synology DS1821+ memory upgrade

SKU CH-ZMMK-AQV5G

32 GB dual-channel DDR4-2666 ECC SODIMM kit with 2Rx8 organisation, CL19 timing and 1.2 V operation for Synology DS1821+ NAS

  • Total capacity32 GB (2 × 16 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 32 GB kit expands Synology DS1821+ capacity
  • ECC protection guards data integrity in NAS workloads
  • 2666 MHz DDR4 matches system-rated speed
  • 2 V low-voltage modules reduce power draw
  • 260-pin SODIMM form factor fits DS1821+ slots

Synology DS1821+ 32 GB DDR4 kit

This 32 GB kit contains two 16 GB DDR4 2666 ECC SODIMM modules built for the Synology DiskStation DS1821+. It targets NAS owners who need reliable memory for file services, virtualization or container workloads.

Upgrade from lower capacity or non-ECC memory

The kit replaces smaller or non-ECC modules to add error correction and extra headroom for ZFS, VMs or heavy multitasking. The jump is worth it when the NAS runs out of RAM during scrub, backup or Docker operations.

Tool-free SODIMM install with ECC verification

Installation takes minutes by opening the chassis and seating both 260-pin sticks until they click. The main risk is mixing ECC with non-ECC modules or skipping the memory test in DSM, which can leave errors undetected.

How it compares

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

Price $228.99
Cheaper than about 57% 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 $7.16 per GB
Cheaper than about 56% 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 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

Questions about this item

Does this kit use the 260-pin SODIMM form factor required by the DS1821+?

Yes, each 16 GB module is a 260-pin DDR4 ECC SODIMM, matching the DS1821+ memory slots exactly.

What is the correct order for seating the two modules in the DS1821+?

Power down the NAS, open the chassis, insert the first stick into the lowest slot until the clips click, then repeat with the second stick in the next slot.

Will the ECC function remain active for the lifetime of the modules?

The on-die ECC circuitry is permanent; no firmware updates or battery-backed components are involved, so error correction persists as long as the hardware operates.

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