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Green rectangular circuit board with black memory chips and gold edge connector

NEMIX RAM

NEMIX RAM 8GB DDR4 2666 ECC SODIMM Synology D4ES01-8G memory upgrade

SKU CH-NWWC-JZWF0

8 GB DDR4 2666 ECC SODIMM module for Synology NAS with CL19 latency and 1.2 V operation

  • Capacity8GB
  • SpeedDDR4 2666 (PC4 21300)
  • ECCYes
  • Buffered/RegisteredUnbuffered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.20V
  • ECC protection guards data integrity in NAS workloads
  • 2666 MT/s DDR4 speed matches Synology D4ES01-8G specs
  • 2 V operation keeps power draw low
  • 260-pin SODIMM form factor fits laptop-style NAS slots
  • Single-rank 1Rx8 layout simplifies memory controller timing

Synology NAS ECC upgrade

This 8GB DDR4 2666 ECC SODIMM is built for Synology NAS units that require the D4ES01-8G part number. It adds error-correcting memory to protect data integrity during file serving and backup tasks. The module is unbuffered and runs at 1.2V, matching the platform's native specification. System administrators upgrading compatible bays will find the capacity increase straightforward.

Tool-free slot insertion

The 260-pin SODIMM fits directly into the NAS memory slot without adapters or screws; most enclosures expose the bay after removing a single cover. Align the notch, press firmly until the side clips click, then replace the cover. The only common issue is inserting the stick at an angle, which prevents the clips from engaging and leaves the system unbootable. Reseating usually resolves it immediately.

Steady throughput under load

Rated at 2666 MT/s with CL19 latency, the module maintains consistent bandwidth during prolonged RAID rebuilds, snapshot replication or multi-user file access. ECC correction operates transparently, preventing silent data corruption without measurable throughput loss. The single-rank 1Rx8 organisation keeps electrical loading light, helping the memory controller sustain stability over hours of continuous operation.

Highlights

  • ECC protection guards data integrity in NAS workloads
  • 2666 MT/s DDR4 speed matches Synology D4ES01-8G specs
  • 2 V operation keeps power draw low
  • 260-pin SODIMM form factor fits laptop-style NAS slots
  • Single-rank 1Rx8 layout simplifies memory controller timing

Specifications

BrandNEMIX RAM
SeriesSynology Compatible Series NAS Memory
ModelSynology DDR4 2666MHZ ECC Unbuffered SODIMM
Part NumberMSE21300-818K1
Capacity8GB
SpeedDDR4 2666 (PC4 21300)
ECCYes
Buffered/RegisteredUnbuffered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.20V
Compatible SystemSynology
CAS LatencyCL19
Heat SpreaderNo
Type260-PIN DDR4 ECC SODIMM
Rank1Rx8
FeaturesDDR4 ECC Unbuffered SODIMM Motherboard Compatible
Package Content8GB (1X8GB) DDR4 2666MHZ PC4-21300 1Rx8 1.2V CL19 260-PIN ECC Unbuffered SODIMM

Questions about this item

How do I confirm the ECC SODIMM is running at 2666 MT/s after installation?

Check the system information page in DSM; it will show the module operating at DDR4 2666 (PC4-21300) with CL19 latency and ECC active

What does the package contain and do I need extra parts?

The box includes one 8 GB 260-pin DDR4 ECC SODIMM (1Rx8, 1.2 V); no cables, brackets or tools are required for Synology NAS slots

Which capacity should I pick for my Synology NAS?

This listing is the single 8 GB D4ES01-8G compatible module; choose it when your NAS has a free SODIMM slot and supports up to 8 GB per slot

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