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

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.