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Synology D4NS01-4G 4GB DDR4-2666 SODIMM RAM for DS225+/DS425+/DS725+

Name: Synology D4NS01-4G 4GB DDR4-2666 SODIMM RAM for DS225+/DS425+/DS725+
Brand: Synology
SKU: B0FF3ZXWR8
Price: 99.99 USD
Availability: InStock

Posted Jun 8, 2026Updated Jul 21, 2026

$99.99$188.00

47% OFFYou save $88.01

Check Current Price on Woot

In Stock

Is this a good deal?

Capacity: 4 GB
OWC 4GB DDR4 2666 PC4-21300 CL19 1Rx8 260-pin 1.2V SODIMM Memory RAM Module Upgrade compatible with Synology D4NS01-4G
100% COMPLIANT: JEDEC-Standard and ROHS Compliant. Warranty-Safe Upgrade. Designed and Tested to Meet or Exceed all Manufacturer OEM Specs.
INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost your PC's Performance.
INDUSTRY LEADING: Consumer-friendly Advanced Replacement Program and Limited Lifetime Warranty, which includes Free Tech Support by Other World Computing.

Great Deal

This 4GB DDR4-2666 SODIMM is a compatible upgrade for Synology DS225+, DS425+, and DS725+ NAS. It offers plug-and-play simplicity backed by a limited lifetime warranty, now 47% off.

What we like

Compatible with specific Synology models
JEDEC-compliant and RoHS certified
Limited lifetime warranty included
Easy plug-and-play installation

Watch out for

Only 4GB capacity, not for heavy multitasking
SODIMM form factor limits aftermarket options

Tip: Ensure your NAS model is on the supported list before purchasing.

Our Take

Best for: Best for Synology DS225+/DS425+/DS725+ owners needing a small RAM bump.

The Synology D4NS01-4G is a 4GB DDR4-2666 SODIMM designed for the DS225+, DS425+, and DS725+ NAS units. At 47% off, this is a solid price for an officially compatible stick that avoids the potential instability of unbranded memory. Installation takes seconds, and the lifetime warranty provides peace of mind. Performance-wise, 4GB is modest - enough for basic file serving and light app use, but don't expect to run multiple Docker containers or VMs without hitting limits. The speed (2666 MT/s) matches the stock RAM, so no compatibility issues. If your workload is light and you need a quick, warranted upgrade, this is a reliable pick. For heavier tasks, consider moving to an 8GB or larger kit instead.

Price Analysis

At $99.99, this 4GB stick is 47% below the original $188 price. While RAM prices fluctuate, this discount brings it in line with compatible third-party modules. If you need the official Synology sticker for warranty or peace of mind, this is a solid buy now.

Common Questions

Is this RAM compatible with Synology DS220+ or other models?

This module is specifically validated for DS225+, DS425+, and DS725+. It may work in other Synology NAS units that use DDR4 SODIMM, but Synology only guarantees full support on listed models.

What is the warranty on this RAM?

It comes with a limited lifetime warranty from Other World Computing (OWC), including free tech support. Woot offers a 90-day limited warranty on this item.

Is this a single stick or a kit?

This is a single 4GB stick (1Rx8). If you need 8GB total, you can purchase two sticks or a single 8GB module.