Synology D4ES01-4G 4GB DDR4 SO-DIMM ECC Memory Module
Enhance your Synology NAS performance and data integrity with the D4ES01‑4G ECC DDR4‑2666 SO‑DIMM, certified for DS1621+, DS1821+, RS1221+ and more. Backed by a 5‑year warranty.
Product Overview
The Synology D4ES01‑4G is a 4 GB DDR4‑2666 MHz ECC unbuffered SO‑DIMM specifically engineered for Synology’s 21‑Series NAS systems. Designed for seamless DSM integration, it provides reliable error correction, compact 260‑pin form factor, and is backed by a robust 5‑year manufacturer warranty.
Key Features
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4 GB DDR4‑2666 MHz (PC4‑21300) with ECC for real-time memory protection.
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260‑pin unbuffered SO‑DIMM, operating at 1.2 V.
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Synology-certified compatibility with models including DS1621+, DS1821+, RS1221+/RP+.
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5‑year warranty ensured by Synology
Technical Specifications
| Attribute | Details |
|---|---|
| Capacity | 4 GB |
| Speed | DDR4‑2666 MHz (PC4‑21300) |
| ECC Support | Yes |
| Form Factor | 260‑pin SO‑DIMM |
| Voltage | 1.2 V |
| Buffering | Unbuffered (non-registered) |
| Warranty | 5 years |
| Compatible Models | DS1621+, DS1821+, RS1221+/RP+ |
Why Choose the D4ES01‑4G?
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Guaranteed compatibility: fully vetted for Synology NAS, avoiding boot or firmware issues
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Enhanced data integrity: ECC ensures single-bit errors are detected and corrected before causing issues
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Compact and efficient: ideal for 21‑Series NAS, supporting multitasking and DSM app performance
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Long-term support: 5‑year manufacturer warranty ensures confidence and coverage
FAQs
Q1: Which models support D4ES01‑4G?
Officially compatible with Synology’s 21‑Series—including DS1621+, DS1821+, and RS1221+ / RP+.
Q2: Is it better than third‑party RAM?
Yes—Synology-certified memory ensures full DSM support, stability, and warranty protection, unlike uncertified alternatives.
Q3: Why choose ECC RAM?
ECC detects and corrects single-bit errors, preventing data corruption—a crucial feature for NAS operations.
Q4: Will adding 4 GB help performance?
Yes—it improves multitasking, caching, and responsiveness for DSM packages like Docker and indexing.
Q5: Can it be mixed with other modules?
Synology recommends using identical modules to retain ECC functionality and system stability.
Q6: How is it installed?
Power off your NAS, insert the SO‑DIMM into an empty slot, then reboot. DSM will auto-detect the new RAM.
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