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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

  • Capacity16GB
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • 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.

Highlights

  • 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

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC Unbuffered UDIMM
Part NumberME21300-628K1
Capacity16GB
SpeedDDR4 2666 (PC4 21300)
ECCYes
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemSynology
CAS LatencyCL19
Heat SpreaderNo
Type288-Pin DDR4 ECC UDIMM
Rank2Rx8
FeaturesDDR4 ECC Unbuffered UDIMM Motherboard Compatible
Package Content16GB (1X16GB) DDR4 2666MHZ PC4-21300 2Rx8 1.2V 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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