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UGREEN 40Gbps M.2 NVMe SSD Enclosure with Dual Chips, External SSD Drive with Cooling Fan, Compatible with Thunderbolt 4/3 USB4/3.2/2.0, Support 1/2/4/8TB M-Key/(M&B) Key 2280 Side SSD Enclsoure

TLDR Review: UGREEN 40Gbps M.2 NVMe SSD Enclosure

Item: UGREEN 40Gbps M.2 NVMe SSD Enclosure
Author: ShopSavvy

By ShopSavvy Team

Published: February 22nd, 2026

Pros

•Supports blazinast real-world transfer speeds near 40Gbps thanks to its dual-chip design that combines Thunderbolt and bridge controllers.
•Consistently achieves read speeds around 2,80,150 MB/s and write speeds around 2,700-2,825 MB/s on high-end systems, making it ideal for large file transfers, backups, and video editing.
•Builn active cooling fan keeps the enclosure and SSD cool, preventing thermal throttling and overheating during heavy use.
•Solid, premium aluminum build enhances heat dissipation and overall durability, paired with a silicone sleeve for extra protection without blocking airflow.
•Supports a wide range of M.2 NVMe SSDs (ey or M&B Key) up to 8TB capacity with S.M.A.R.T. and TRIM support for maintaining drive health and performance.
•Easy, secure installation with minimal screws and a included thermal pad; no driver installation needed across Windows, macOS, and Linux.
•Works seamlessly with Thunderbolt 4/3, USB4, 3.2, and 2.0 interfaces, providing excellent compatibility across devices.
•Delivers consistent, stable operation without random disconnections.
•Quiet fan operation in most situations and automatic activation above 40°C safeguards the drive without user intervention.
•Performs exceptionally well with large video and photo files, making it a top choice for creative professionals and power users.

Cons

•The enclosure is larger than typical consumer models, which might be inconvenient for portability or users looking for a more compact solution.
•The active cooling fan runs continuously and is not temperaturontrolled, which some users find a bit noisy and distracting, particularly when used with quieter laptops like modern MacBooks.
•The included 30cm cable is somewhat short, requiring the enclosure to be positioned close to the computer for optimal connectivity.
•Not compatible with drives that have prnstalled heatsinks, PCIe 5.0 SSDs, or SATA-based M.2 drives, limiting drive choice for some users.
•While very fast, it does not support Thunderbolt 5, so it may not be the absolute fastest option on the market as newer interfaces roll out.
•Slightly larger size is a tradff for better cooling but may be a drawback for users prioritizing compactness over thermal management.

Bottom Line

The UGREEN 40Gbps M.2 NVMe SSD Enclosure is a robust and high-performance external SSD solution that excels at delivering sustained Thunderbolt-level speeds with excellent cooling and build quality. It’s perfect for users who prioritize speed, thermal stability, and compatibility with a wide range of NVMe drives up to 8TB. However, if quiet operation and ultra-compact size are top priorities, you might want to consider other enclosures with smaller footprints or more advanced fan control. Overall, this enclosure strikes a strong balance for professionals needing reliable, fast, and efficient external SSD storage.