Buying Guide
The Best 40Gbps NVMe Enclosures for Everyday Desk Work
We looked at 7 40Gbps NVMe enclosures side by side, with the trade-offs that separate them and who each one suits.
By Jamie Cole, Lead Product Researcher
10 min read7 products evaluated
We may earn a commission from purchases made through links in this guide. Learn more.
40Gbps NVMe enclosures commonly use a USB4 bridge chip (ASM2464PD or JHL7440) and may separately advertise Thunderbolt 3/4 compatibility. Current products report real read/write results roughly in the 2,700-3,900MB/s range, meaningfully below the theoretical 5GB/s link rate.
We required a documented 40Gbps USB4 or Thunderbolt-class interface, publishing bridge controller and tested throughput where available, and noted which models add active fan cooling versus fanless designs for sustained transfers.
Quick Picks
Our 7 recommendations at a glance. Tap a pick for the full verdict.
Best Overall
Sabrent EC-U4TN USB4 NVMe Enclosure
Buyers prioritizing up to 3,900mb/s usb4 / 2,700mb/s tb3-4
Our take Check price for Sabrent EC-U4TN USB4 NVMe Enclosure (opens in a new tab)
Runner-Up
UGREEN 40Gbps M.2 NVMe Enclosure
Buyers prioritizing 40gbps via asm2464pd, usb4/tb3/tb4
Our take Check price for UGREEN 40Gbps M.2 NVMe Enclosure (opens in a new tab)
Also Great
ACASIS TBU405 Pro 40Gbps NVMe Enclosure
Buyers prioritizing 40gbps via intel jhl7440, usb4/tb3/tb4
Our take Check price for ACASIS TBU405 Pro 40Gbps NVMe Enclosure (opens in a new tab)
Strong Alternative
UGREEN 40Gbps NVMe Enclosure with Cooling Fan
Buyers prioritizing 40gbps via asm2464pd, active pwm fan
Our take Check price for UGREEN 40Gbps NVMe Enclosure with Cooling Fan (opens in a new tab)
Worth Considering
Rosewill RNE-01 40Gbps NVMe Enclosure
Buyers prioritizing up to 3,187mb/s via asm2464pd
Our take Check price for Rosewill RNE-01 40Gbps NVMe Enclosure (opens in a new tab)
Solid Option
ANYOYO 40Gbps NVMe Enclosure
Buyers prioritizing up to 2,700mb/s, dual jhl7440 + rtl9210 chips
Our take Check price for ANYOYO 40Gbps NVMe Enclosure (opens in a new tab)
Budget Pick
ACASIS TBU406 Pro Fanless 40Gbps Enclosure
Buyers prioritizing 40gbps via intel jhl7440, fanless
Our take Check price for ACASIS TBU406 Pro Fanless 40Gbps Enclosure (opens in a new tab)
Our Picks
Best Overall1 of 7
Sabrent EC-U4TN USB4 NVMe Enclosure on Amazon (opens in a new tab)
Rated up to 3,900MB/s over USB4 or 2,700MB/s over Thunderbolt 3/4, with backward compatibility down to USB-C 20/10/5Gbps ports.
Best for
- Buyers prioritizing up to 3,900mb/s usb4 / 2,700mb/s tb3-4
Why we like it
Unlike Sabrent's fanless 10Gbps model, this one adds an integrated active cooling fan to sustain performance during large transfers. Optimized for PCIe Gen4 x4 SSDs like Sabrent's own Rocket 4 Plus line, works on both Windows and macOS with no drivers.
2 NVMe Enclosure for one main reason. Highest USB4 throughput (3,900MB/s) among 40Gbps picks in this cluster. 2 NVMe Enclosure, which is worth weighing if cost is your deciding factor between the two.
On the other side, Fan adds some operating noise versus fanless competitors.
Key dimensions & specs
- Up to 3,900MB/s USB4 / 2,700MB/s TB3-4
- 2230/2242/2260/2280, NVMe only
- Active cooling fan
Pros
- Highest USB4 throughput (3,900MB/s) among 40Gbps picks in this cluster
- Active cooling fan sustains speed during large transfers
- Backward compatible down to 5Gbps USB-C ports
- Optimized for high-performance PCIe Gen4 SSDs
Cons
- NVMe only, no SATA M.2 support
- Fan adds some operating noise versus fanless competitors
Runner-Up2 of 7
UGREEN 40Gbps M.2 NVMe Enclosure on Amazon (opens in a new tab)
Built around the ASM2464PD chip for up to 3600MB/s over USB4/Thunderbolt 3/4 (Thunderbolt 4 cable and device required to hit the full speed), with a double-sided fin design plus a three-dimensional cooling system that UGREEN says delivers several times the heat dissipation of standard enclosures, entirely fanless.
Best for
- Buyers prioritizing 40gbps via asm2464pd, usb4/tb3/tb4
Why we like it
Supports 2230/2242/2260/2280 NVMe SSDs up to 8TB, but not SSDs with a pre-installed heatsink or SATA NGFF/MSATA drives. UGREEN notes some thicker SSDs may need a thinner thermal pad swapped in to fit properly.
On the other side, Some thicker SSDs need a thinner thermal pad swap to fit.
Key dimensions & specs
- 40Gbps via ASM2464PD, USB4/TB3/TB4
- 2230/2242/2260/2280 NVMe, up to 8TB
- Fanless double-sided fin cooling
Pros
- Fanless double-sided fin design avoids fan noise entirely
- ASM2464PD chip is a proven, widely-used 40Gbps bridge
- Compatible across USB4, Thunderbolt 3, and Thunderbolt 4 hosts
- Ultra-slim aluminum body for portability
Cons
- Requires a genuine Thunderbolt 4 cable/host to hit full 3600MB/s
- Some thicker SSDs need a thinner thermal pad swap to fit
Also Great3 of 7
ACASIS TBU405 Pro 40Gbps NVMe Enclosure on Amazon (opens in a new tab)
Built around the Intel JHL7440 certified chip for true USB4/Thunderbolt 4/3 compatibility with a dual-chip design, plus an integrated cooling fan and precision heat-dissipation holes to prevent thermal throttling under sustained load.
Best for
- Buyers prioritizing 40gbps via intel jhl7440, usb4/tb3/tb4
Why we like it
ACASIS tested read/write speeds up to 2,805/2,734 MB/s using a Samsung 980 Pro on a MacBook, and it supports 2230/2242/2260/2280 sizes for M1/M2/M3 Mac and PC hosts. Its compact, travel-friendly form factor targets pro users needing a genuine Thunderbolt-certified enclosure, not just a compatible one.
On the other side, Fan adds some operating noise.
Key dimensions & specs
- 40Gbps via Intel JHL7440, USB4/TB3/TB4
- Tested 2,805/2,734 MB/s read/write
- Active cooling fan
Pros
- Intel JHL7440 is a certified Thunderbolt chip, not just compatible hardware
- Tested real-world speeds published (2,805/2,734 MB/s), not just theoretical link rate
- Active cooling fan with precision heat-dissipation holes
- Compact, travel-friendly form factor for pro use
Cons
- Requires Thunderbolt 4/3 or USB4 host for full speed
- Fan adds some operating noise
Strong Alternative4 of 7
UGREEN 40Gbps NVMe Enclosure with Cooling Fan on Amazon (opens in a new tab)
Adds UGREEN's PWM turbo high-speed fan on top of the same triple heat-dissipation approach (aluminum casing, silicone thermal pad) used in its fanless model, automatically adjusting fan speed to maintain temperature while staying relatively quiet.
Best for
- Buyers prioritizing 40gbps via asm2464pd, active pwm fan
Why we like it
The real tradeoff against that pick: 4TB capacity ceiling versus 8TB competitors.
Key dimensions & specs
- 40Gbps via ASM2464PD, active PWM fan
- 2230/2242/2260/2280, up to 4TB
- S.M.A.R.T. self-monitoring
Pros
- PWM turbo fan automatically adjusts speed to maintain temperature
- S.M.A.R.T. self-monitoring reports drive health
- Same proven ASM2464PD bridge chip as UGREEN's fanless model
- Silicone case included to protect the enclosure
Cons
- 4TB capacity ceiling versus 8TB competitors
- Does not support SSDs with a heatsink or PCIe 5.0 drives
Worth Considering5 of 7
Rosewill RNE-01 40Gbps NVMe Enclosure on Amazon (opens in a new tab)
2 NVMe SSDs in 2230-2280 sizes, rated up to 3,187MB/s over the 40Gbps interface.
Best for
- Buyers prioritizing up to 3,187mb/s via asm2464pd
Why we like it
The built-in fan and vent design support up to 4 hours of sustained full-speed operation.
Features a transparent back plate showing internal components, and the compact RNE-01 form factor is built to fit in a pocket or bag for mobile professionals. Works across macOS and Windows, supports drives up to 8TB.
On the other side, Speed varies notably by host system and SSD per Rosewill's own disclaimer.
Key dimensions & specs
- Up to 3,187MB/s via ASM2464PD
- 2230-2280, up to 8TB
- Rated for 4 hours sustained full-speed operation
Pros
- Rated for 4 hours of sustained full-speed operation, not just a burst benchmark
- Transparent back plate for a distinctive look
- Same proven ASM2464PD chip used across several competitors
- Compact, pocket-friendly form factor
Cons
- 3,187MB/s is on the lower end of 40Gbps-class enclosures
- Speed varies notably by host system and SSD per Rosewill's own disclaimer
Solid Option6 of 7
ANYOYO 40Gbps NVMe Enclosure on Amazon (opens in a new tab)
5GB file in a few seconds.
Best for
- Buyers prioritizing up to 2,700mb/s, dual jhl7440 + rtl9210 chips
Why we like it
The aluminum alloy shell pairs with a PWM turbo high-speed fan that automatically adjusts speed to maintain temperature while staying relatively quiet, supporting 2230/2242/2260/2280 SSDs up to 8TB (M and B&M key), not SATA NGFF or MSATA.
On the other side, No SATA support.
Key dimensions & specs
- Up to 2,700MB/s, dual JHL7440 + RTL9210 chips
- 2230/2242/2260/2280, up to 8TB
- PWM auto-adjusting fan
Pros
- Dual-chip design (JHL7440 + RTL9210) for broad host compatibility
- PWM fan automatically balances cooling against noise
- Supports up to 8TB across all four common M.2 sizes
- Tool-free installation, no drivers needed
Cons
- 2,700MB/s is on the lower end of 40Gbps-class enclosures
- No SATA support
Budget Pick7 of 7
ACASIS TBU406 Pro Fanless 40Gbps Enclosure on Amazon (opens in a new tab)
A fanless alternative to ACASIS's fan-cooled TBU405 Pro, using dual-sided aluminum fins for silent passive cooling with zero moving parts and no fan-failure risk, aimed at recording studios and quiet offices.
Best for
- Buyers prioritizing 40gbps via intel jhl7440, fanless
Why we like it
Built on the certified Intel JHL7440 chip for genuine Thunderbolt 5/4/3 and USB4 compatibility, with tested read/write speeds up to 2,805/2,734 MB/s using a Samsung 980 Pro on MacBook, identical performance to ACASIS's fan-cooled model.
The real tradeoff against that pick: Passive-only cooling may throttle sooner than fan-cooled models under sustained heavy load.
On the other side, No active cooling override for extreme workloads.
Key dimensions & specs
- 40Gbps via Intel JHL7440, fanless
- Tested 2,805/2,734 MB/s read/write
- Dual-sided aluminum fin passive cooling
Pros
- Completely fanless, zero noise and no fan-failure risk
- Same certified Intel JHL7440 chip as ACASIS's fan-cooled model
- Same tested performance (2,805/2,734 MB/s) without the fan
- Ideal for quiet environments like studios or offices
Cons
- Passive-only cooling may throttle sooner than fan-cooled models under sustained heavy load
- No active cooling override for extreme workloads
How We Chose These 40Gbps NVMe Enclosures
Each pick was assessed across 5 criteria weighted for real-world use.
- Interface Protocol & Link Rate
- Verified the exact USB/Thunderbolt protocol and rated speed from each listing rather than assuming USB-C connector shape implies a specific bandwidth tier.
- Bridge Controller & Host Compatibility
- Checked which bridge chip each enclosure uses where published, and cross-referenced explicit host compatibility statements (Mac generation, Thunderbolt version, USB4 V1 vs V2) against real-world limitations sellers disclosed.
- 2 Size, Keying & SSD Compatibility
- 2 lengths (2230/2242/2260/2280), keying (M-Key vs B+M Key), and NVMe-versus-SATA protocol support rather than assuming universal compatibility.
- Thermal Design & Sustained Performance
- Weighed published tested throughput figures, fan trigger temperatures, and passive-versus-active cooling design over marketing language that repeats across nearly identical products.
- Prioritized genuine differentiators, RAID mode support, write-lock switches, health-monitoring displays, magnetic attachment systems, over generic "fast and durable" claims with nothing behind them.
What to Look for in a 40Gbps NVMe Enclosure
Key buying criteria so you get the right fit the first time.
USB-C is a connector shape, not a speed, so check the actual protocol
2 Gen 2, 20Gbps Gen 2x2, and 40 or 80Gbps Thunderbolt/USB4, all of which physically plug into the exact same port shape on both the enclosure and your computer.
This matters because a listing photo or the word "USB-C" tells you nothing about which of these tiers you're actually getting, and plugging a 40Gbps enclosure into a 10Gbps port (or vice versa) simply caps your real transfer speed at whichever side is slower, wasting money if you bought the faster one for no benefit.
2 Gen 2, Gen 2x2, USB4, Thunderbolt 3/4/5) and confirm your own computer's exact port spec from its manufacturer documentation before assuming compatibility.
The bridge controller chip inside the enclosure affects real performance, not just the headline speed
2 NVMe SSD's native protocol and the external USB or Thunderbolt connection, and different controllers, such as the RTL9210, JMS583, or ASM2464PD, have measurably different real-world characteristics including sustained throughput, TRIM command support, and how gracefully they handle heat under long transfers.
Two enclosures can carry the identical headline speed rating while performing noticeably differently in practice because one uses a more capable or more recent controller chip than the other, and this is exactly the kind of difference that a spec sheet's top-line number won't reveal.
Confirm NVMe-only versus NVMe-plus-SATA support against your specific SSD
2 physical connector), and an enclosure built for one protocol generally cannot read a drive using the other, regardless of how similar the slot looks.
2 drive can easily purchase an NVMe-only enclosure and find the drive simply isn't recognized at all.
Check your specific SSD's protocol (printed on the drive itself or in its own listing) against the enclosure's stated support before buying, and if you're unsure which protocol you own, look specifically for NVMe-plus-SATA dual-protocol enclosures to avoid the issue entirely.
Separate peak benchmark speed from real sustained transfer performance
A short benchmark test, the kind used in most marketing screenshots, can hit an enclosure's peak rated speed for a few seconds even on a design with poor sustained performance, because SSDs and enclosures both have cache and thermal buffers that mask throttling until a transfer runs long enough to exhaust them.
This matters most if your actual use case involves copying large video files, disk images, or backups that run for minutes rather than seconds, since that's exactly when a fanless, poorly-cooled enclosure will throttle and its real speed will drop well below the number advertised on the box.
Favor listings that publish tested read and write numbers using a named SSD and host device over theoretical link-rate claims alone, and treat passive cooling as a real limitation for sustained large-file work specifically.
2 length and keying, since not every size fits every enclosure
2 SSDs come in several different physical lengths, commonly 2230, 2242, 2260, and 2280 (the numbers refer to width and length in millimeters), and also use different pin "keying" notches, most commonly M-Key for NVMe drives or B+M Key for drives that also support SATA, and an enclosure's internal slot is generally built to accept only a specific subset of these combinations rather than all of them universally.
A drive that's physically too long for a slot simply won't fit at all, while a keying mismatch can prevent the drive from making electrical contact even if it appears to slide in, so this isn't a minor compatibility footnote, it's a hard physical constraint.
How to Choose a 40Gbps NVMe Enclosure
Every pick in this specific comparison runs at 40Gbps, so speed isn't the differentiator here, drive size compatibility is. 2 lengths in this comparison, including the shorter 2230/2242/2260/2280 sizes, worth checking against your specific SSD's length before ordering.
| ACASIS TBU405 Pro 40Gbps NVMe Enclosure | |
| No firm budget ceiling, prioritizing speed or controller quality | Sabrent EC-U4TN USB4 NVMe Enclosure |
NVMe-Only vs NVMe+SATA Dual Protocol
- 2 drive at all if that's what you own. 2 NVMe Enclosure, ACASIS TBU405 Pro 40Gbps NVMe Enclosure, UGREEN 40Gbps NVMe Enclosure with Cooling Fan.
- 2 drives in the same enclosure, more flexible if you're not certain which protocol your SSD uses. In this comparison: Sabrent EC-U4TN USB4 NVMe Enclosure.
Most buyers with a known NVMe SSD should default to an NVMe-only pick like ANYOYO 40Gbps NVMe Enclosure, and only pay extra for Sabrent EC-U4TN USB4 NVMe Enclosure's dual-protocol support if you're not certain which type of drive you own.
| Sustained large transfers (video editing, backups) | Sabrent EC-U4TN USB4 NVMe Enclosure |
|---|
For Sustained Large File Transfers Specifically
- Published tested read/write numbers using a named SSD and host, active cooling or substantial heatsink fins, and an explicit note about sustained (not just peak burst) performance.
- Sabrent EC-U4TN USB4 NVMe Enclosure fits this specifically: Highest USB4 throughput (3,900MB/s) among 40Gbps picks in this cluster.
- You want what Sabrent EC-U4TN USB4 NVMe Enclosure offers: Highest USB4 throughput (3,900MB/s) among 40Gbps picks in this cluster. That's a real functional upgrade over the budget picks here, not just a brand markup.
- ANYOYO 40Gbps NVMe Enclosure already covers the essentials: Dual-chip design (JHL7440 + RTL9210) for broad host compatibility. The main thing you'd be paying extra for elsewhere in this list is a faster interface tier or dual-protocol support you may not need.
Frequently Asked Questions
Does a faster enclosure automatically mean faster real-world transfers?
Real throughput depends on the SSD's own generation and speed, the bridge controller inside the enclosure, cable quality, and whether the host port actually supports the claimed protocol. A 40Gbps enclosure with a slow SSD won't outperform a 10Gbps enclosure with a fast one by much.
2 NVMe SSD in any enclosure in this list?
Why does my enclosure run slower than its advertised speed?
2 Gen 2x2 at 10Gbps, for example), an underrated USB-C cable, or sustained thermal throttling on a fanless design during a long transfer.
Bottom Line
Best overall: Sabrent EC-U4TN USB4 NVMe Enclosure — best overall pick in this roundup. See the full verdicts above for every pick, with pros, cons and who each one suits.
Browse all 40gbps nvme enclosures on Amazon — Prime-eligible options with current pricing.