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Green 288-pin DDR4 UDIMM module, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC UDIMM CL19 1.2V 2Rx8 Synology RS4021xs+ memory upgrade

SKU CH-1FW6-992C7

16 GB DDR4-2666 ECC UDIMM module rated CL19 at 1.2 V for Synology RS4021xs+ NAS upgrades

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 16 GB capacity expands NAS storage for larger workloads
  • ECC protection detects and corrects single-bit memory errors
  • DDR4 2666 speed matches Synology RS4021xs+ specifications
  • Low 1.2 V voltage reduces power draw and heat
  • 288-pin UDIMM form factor installs directly in compatible slots

Synology RS4021xs+ 16 GB DDR4 2666 ECC UDIMM

This module adds 16 GB of DDR4 2666 memory to a Synology RackStation RS4021xs+ NAS. It runs at 1.2 V with CL19 latency and includes on-die ECC for data integrity. The single stick suits administrators who need to expand capacity in a validated configuration.

288-pin unbuffered UDIMM with major OEM chips

The stick uses a standard 288-pin DDR4 UDIMM form factor and is unbuffered, so it installs directly into the NAS memory slots without registered buffering. Chips are sourced from Samsung, Micron or Hynix depending on supply. No heat spreader is fitted, keeping the profile low for dense rack chassis.

Low-voltage DDR4 operation at 1.2 V

At 1.20 V the module draws minimal power and generates little heat inside a closed NAS enclosure. Passive cooling from system airflow is sufficient; no active fan is required on the DIMM itself. The ECC function corrects single-bit errors during sustained workloads without increasing voltage or noise.

How it compares

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

Price $119.99
Cheaper than about 65% 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 $7.50 per GB
Cheaper than about 54% 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 numberME21300-628K1
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 DDR4 standard does the PC4-21300 rating cap the module at?

PC4-21300 corresponds to DDR4 2666, so the module runs at 2666 MT/s with CL19 latency.

What physical slot and pin count does this 288-pin UDIMM require?

It fits a standard 288-pin DDR4 UDIMM slot on the Synology RS4021xs+ motherboard.

How is the module installed and which orientation step is often missed?

Power off the NAS, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until the retention clips click.

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