UGREEN 15976-40GB M.2 NVMe Enclosure, USB4 40Gbps

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Product guide

UGREEN 15976-40GB M.2 NVMe Enclosure, USB4 40Gbps

USB4: UGREEN 15976-40GB is a fan-cooled M.2 NVMe SSD enclosure with a claimed 40Gbps transfer rate. Its aluminium housing and PWM fan suit buyers moving large files, but the drive must be a compatible NVMe model and the host connection affects achievable speed.

At a glance

The listing claims compatibility with USB4, USB 3.2, 3.1, 3.0, 2.0 and Thunderbolt 3 and 4 connections.
The stated SSD capacity limit in the feature description is 4TB, while the details field separately lists 8 TB.
Supports M.2 NVMe drives in four listed lengths, with M/B+M key compatibility stated in the feature text.
Active fan cooling supplements the aluminium casing and thermal pad. The fan speed is described as automatically adjustable.

Price

$75.99Save 16%

Reference price: ~~$89.99~~

Price checked: Nov 13, 2026

View offer

Often bought together

SAMSUNG 990 PRO SSD 2TB PCIe Gen4 NVMe M.2 Internal Solid State Hard Drive, Upto 7,450MB/s, Fast Speed for Gaming Heat Control, Direct Storage and Memory Expansion, MZ-V9P2T0B/AM [Canada Version]

$656.40

Pros and cons

Pros

A built-in fan and thermal pad provide active cooling alongside the aluminium casing.
Four common M.2 lengths are listed, giving buyers options beyond 2280 drives.
S.M.A.R.T. monitoring and TRIM are stated as supported functions.

Technical specifications

14 specifications

Identity
Brand	UGREEN
Model	15976-40GB

Connectivity and controls
Connection listed	Thunderbolt

Drive compatibility
Maximum capacity in feature description	4TB
Supported SSD sizes	2230 2242 2260 2280
Supported SSD key types	M/B+M key

Performance and cooling
Claimed data transfer rate	40 gigabits_per_second
Cooling	PWM turbo high-speed fan, aluminum alloy casing and silicone thermal pad

Materials and protection
Material	Aluminum
Included protection claim	Silicone case effectively mitigates the impact on the hard drive enclosure

Dimensions and installation
Weight listed	0.2 kg
Dimensions listed	12L x 4.8W x 1.9H centimetres

Computing specifications
Storage listed	8 TB
Compatible operating systems	Windows Mac OS Linux Android

What to know before buying

Listing details to confirm

The listing details conflict: the title and feature copy claim USB4 and up to 40Gbps, while the interface detail lists Thunderbolt. Its maximum capacity is stated as 4TB in feature copy but 8 TB in details, and the listed dimensions appear in differing formats. Confirm the drive capacity, host compatibility and dimensions for the selected listing before purchase. The feature copy excludes SATA NGFF and mSATA drives.

Who is it for?

A good fit for

People who already own a supported M.2 NVMe SSD and want a portable external enclosure for file transfers or backups.
Users seeking active cooling and support for 2230, 2242, 2260 or 2280 NVMe drives.

Less suited to

Buyers looking for an enclosure that supports SATA NGFF or mSATA drives.
Buyers who need a confirmed 8TB capacity limit or guaranteed compatibility with a particular host, especially an M1 MacBook Air.

UGREEN 15976-40GB M.2 NVMe Enclosure, USB4 40Gbps · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.1 / 5 · 1,247 ratings

5 stars62%62%
4 stars13%13%
3 stars10%10%
2 stars7%7%
1 star8%8%

Customer feedback reports good speed and a solid-feeling build, while also noting cable and connectivity concerns, including a report that the enclosure may not work with an M1 MacBook Air. Experiences with heat, the fan and cables are mixed. For buyers planning sustained transfers, the cooling design is relevant, but reported feedback does not establish consistent results. Aggregate ratings are generally more positive than negative, though they do not explain individual experiences.

Positive themes

Customer feedback describes speed as good and the enclosure as well built and solid in hand.

Negative themes

Feedback includes cable problems and a report of possible incompatibility with an M1 MacBook Air.

Mixed feedback

Customer feedback is mixed on heat, fan behaviour and cables.

Frequently asked questions

Which SSDs fit this enclosure?

The feature description lists M.2 NVMe drives with M/B+M key types in 2230, 2242, 2260 and 2280 sizes. It says SATA NGFF and mSATA drives are not supported.

Is the enclosure rated for 4TB or 8TB?

The feature description specifies a maximum of 4TB, while the details section lists 8 TB. Treat the capacity as unconfirmed and check the selected listing before buying.

Does it support USB4 and Thunderbolt?

The title and feature text claim USB4 and compatibility with Thunderbolt 3 and 4, but the hardware-interface detail lists only Thunderbolt. Confirm compatibility with your host and cable.

Does the enclosure include an SSD?

The supplied package information does not identify an SSD as included. The listed product is an enclosure, so plan on a compatible M.2 NVMe drive unless the selected listing explicitly says otherwise.