NVMe enclosures / Comparison

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Documented specifications and exact purchase packages
Compare the details	TBU405M1 40Gbps NVMe enclosure (US selection)	40Gbps M.2 NVMe Enclosure with Cooling Fan 15976 (US selection)
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US purchase package	Dark Grey / TBU405M1 (Tool-Free), SKU TBU405M1-G; not TBU405Pro (Built-in Fan) or TBU405 (Screw fix); enclosure only, no SSD. Product & sources Empty enclosure only; supply a compatible SSD separately. The store shows a US delivery estimate and says it ships to 74 countries. No current stock, delivery or checkout test is claimed. Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	SKU 15976, 40Gbps M.2 NVMe Enclosure with Cooling Fan, gray; enclosure only, no SSD; not the 10Gbps M.2 NVMe SATA enclosure or a Thunderbolt 5 model. Product & sources Empty enclosure only; supply a compatible SSD separately. The store says orders ship from its US warehouses. No current stock or checkout test is claimed. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Where to buy	Select: Dark Grey / TBU405M1 (Tool-Free), SKU TBU405M1-G; not TBU405Pro (Built-in Fan) or TBU405 (Screw fix); enclosure only, no SSD. View at ACASIS — TBU405M1 40Gbps NVMe enclosure (US selection); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.	Select: SKU 15976, 40Gbps M.2 NVMe Enclosure with Cooling Fan, gray; enclosure only, no SSD; not the 10Gbps M.2 NVMe SATA enclosure or a Thunderbolt 5 model. View at UGREEN — 40Gbps M.2 NVMe Enclosure with Cooling Fan 15976 (US selection); opens in a new tab The link may open several packages. Check current price and availability with the seller. Opens in a new tab.
Nominal host interface The advertised maximum host-link rate. This is not a file-transfer benchmark. The host, bridge, cable and SSD can each limit results.	40 Gb/s Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	40 Gb/s Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Supported drive protocol Documented SSD protocols for the enclosure. M.2 describes a physical format; NVMe and SATA are different protocols. Match both.	M.2 PCIe NVMe; M-key and B+M-key drives. Sources · 2026-10-21 ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.	M.2 NVMe; M-key and B+M-key drives. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
M.2 SATA support Whether SATA drives are explicitly supported. A matching connector or length does not establish SATA support. Unknown is not a confirmed no.	Not verified We have not verified this value. It is not a confirmed no or zero. Check the original source or ask the manufacturer if it affects your choice. The page and manual list PCIe NVMe only and do not mention M.2 SATA; this is not recorded as a confirmed exclusion. Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	NoUGREEN states it does not support SATA NGFF or mSATA solid-state drives. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Supported M.2 lengths Documented length codes and any source disagreement. Check both the mounting position and component clearance, especially for double-sided drives.	The manual lists 2280 (22 × 80) only; the product page says any size of PCIe NVMe SSD.Confirm mounting for a shorter drive with ACASIS before relying on it. Sources · 2026-10-21 ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.	2230, 2242, 2260 and 2280. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Included SSDs Storage drives supplied with the exact purchase option. These selections are empty enclosures. A populated bundle is a different package.	0 drives Source · 2026-10-21 ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	0 drivesThe included-components list names no SSD. A 'Hard Disk Size: 4 TB' specification attribute is not treated as a supplied drive. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Drive installation The documented enclosure opening and drive-retention method. Tool-free does not eliminate thermal-pad placement or careful handling of the SSD.	Tool-free: open the bottom plate, fit the rubber stopper to hold the SSD, then close the lower cover. No driver or external power supply is required. Sources · 2026-10-21 ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.	A screwdriver is included; the retrieved text does not describe the drive-retention steps. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Cooling arrangement Documented enclosure materials and heat-transfer components. A heat sink is not proof of sustained speed or that every drive avoids throttling.	Aluminum alloy shell with a corrugated surface and a thermal pad; no fan on TBU405M1. The built-in fan is the TBU405Pro difference. Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	Aluminum alloy shell, silicone thermal pad and a PWM fan that adjusts its speed automatically; an external silicone case is supplied. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Included host cables Cable contents established for the selected package. A cable that fits physically may not support the advertised rate. Regional packing lists remain separate.	One Thunderbolt cable is listed in the manual's package contents; its length and rating are not stated. Source · 2026-10-21 ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	One USB-C to USB-C cable and one USB-C to USB-A cable; lengths and rated speeds are not stated. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Host requirements Required interface and operating conditions. Using a faster host port does not upgrade the enclosure bridge. Formatting and file-system support are separate.	Thunderbolt 3/4 or USB4 host for the 40 Gb/s mode. The page attributes backward compatibility with Thunderbolt 5/4/3 and USB4/3.2/3.1/3.0/2.0 to its dual-chip design but does not state the transfer rate on a USB 3.2 or older host. An iPhone 15 Pro Max may need a 10Gbps cable or a powered dock. Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	USB4-compatible Type-C interface, listed as compatible with USB4/3.2/3.1/3.0/2.0 and Thunderbolt 3/4. The 40 Gb/s rate needs a matching host and cable; the page does not state the rate through the USB-C to USB-A cable. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Explicit compatibility limits Important exclusions and capacity or revision conditions. Use the exact drive and enclosure revision. Do not treat a generic NVMe label as universal compatibility.	TBU405M1 supports SSDs up to 8TB, and ACASIS advises against SSDs with heat sinks. Its speed and temperature figures are ACASIS laboratory results with named equipment, not guarantees. Sources · 2026-10-21 ACASIS: 40Gbps Tool-free M.2 NVMe SSD Enclosure (TBU405 family) product pageChecked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.ACASIS: TBU405M1 user manualChecked 2026-10-21. We read the original PDF on the check date.	Drives up to 4TB; SATA NGFF and mSATA drives are excluded. S.M.A.R.T. and TRIM support are manufacturer claims, not tested here. Source · 2026-10-21 UGREEN: 40Gbps M.2 NVMe Enclosure with Cooling Fan US product page (SKU 15976)Checked 2026-10-21. We reviewed the official page text on the check date. Checkout options were not verified.
Questions to check before buying	The manual lists 2280 only while the product page says any size; shorter drives are not confirmed. The manual gives two different dimension figures and no cable length or rating. One listing sells three versions; only TBU405M1 (SKU TBU405M1-G) is represented by this record.	No CM-series model number appears in the retrieved page text; the package is identified by UGREEN SKU 15976. Cable lengths and ratings and the drive-retention method are not stated in the retrieved text.

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