StarTech.com
StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter
Bottom line: The StarTech.com M.2. PCI-e NVMe to U.2 Adapter ($31.73 on Amazon as of 2026-10-21 16:28 UTC): Up to 7.8GBps transfer speeds when paired with a PCIe Gen 4 slot or system; main trade-off: not compatible with M.2 SATA SSDs; PCIe NVMe or AHCI drives only.
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*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
Pros & Cons
Pros
- ✓ Up to 7.8GBps transfer speeds when paired with a PCIe Gen 4 slot or system
- ✓ Fits standard 2.5-inch drive bays, so M.2 SSDs mount in server or desktop cages
- ✓ Connects to any U.2 (SFF-8639) compatible host interface or backplane
- ✓ Supports M.2 PCIe NVMe and AHCI SSDs, backward compatible with older NVMe drives
- ✓ Native OS support and TAA compliance for institutional and government builds
Cons
- ✗ Not compatible with M.2 SATA SSDs; PCIe NVMe or AHCI drives only
- ✗ Will not work with SATA or SAS host controllers
- ✗ Requires a free U.2 (SFF-8639) port on your motherboard, backplane or HBA
- ✗ Holds a single M.2 M-Key SSD; no multi-drive option
Manufacturer description
The StarTech.com M.2 PCIe NVMe to U.2 adapter turns a standard M.2 SSD into a drive that fits a 2.5-inch bay and connects to a U.2 (SFF-8639) host interface. This lets you use the M.2 NVMe drives you already own, or cheaper ones, in servers and workstations built around U.2 bays and backplanes, so you don't have to buy enterprise U.2 SSDs. The adapter holds one M.2 PCIe SSD (M-Key) and works with both NVMe and AHCI drives. It is also backward compatible with earlier generations of PCIe NVMe drives. In a PCIe Gen 4 slot or system, StarTech.com rates transfer speeds at up to 7.8GBps. Setup…
SpecPicks Verdict
SpecPicks scored StarTech.com M.2. PCI-e NVMe to U.2 Adapter using a rating × review-volume × price-fit model applied to published specs and reviews across the storage adapters category. StarTech.com's storage adapters lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.
Common buyer scenarios for storage adapters of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.
Frequently Asked Questions
Will this adapter work with my M.2 SATA SSD?
No. The StarTech.com adapter supports only M.2 PCIe SSDs (NVMe or AHCI) with an M-Key connector. M.2 SATA drives are not compatible.
Can I plug it into a SATA or SAS port on my server?
No. The adapter needs a U.2 (SFF-8639) compatible host interface. It is not compatible with SATA or SAS host controllers, even though U.2 backplanes often look similar.
How fast is an NVMe SSD through this adapter?
StarTech.com rates transfer speeds at up to 7.8GBps when you use it with a PCIe Gen 4 slot or system. Real speeds also depend on your SSD and on the PCIe generation of your host.
Does it fit a standard 2.5-inch drive bay?
Yes. The adapter converts an M.2 SSD into the 2.5-inch form factor, so it fits standard 2.5-inch drive bays in desktops and servers.
Do I need special drivers to use it?
The adapter uses native OS support, so the installed NVMe drive works through your operating system's built-in support. Check the product listing for current OS compatibility and warranty terms.
Key Features
- BOOST SYSTEM PERFORMANCE: Add the fast performance of a PCIe M.2 NVMe or AHCI SSD to your desktop computer or server, this adapter converts the drive to fit into a 2.5" drive bay and connect to a U.2 (SFF-8639) compatible host interface
- PCIe M.2 SSD TO 2.5" U.2 ADAPTER: Increase your system speed and performance cost-effectively, by adding an M.2 PCIe NVMe/AHCI SSD to your PC or server with data transfer speeds up to 7.8GBps when used with a PCIe Gen 4 slot/system
- HASSLE-FREE SETUP: This M2 to U.2 adapter offers a fast and easy setup with native OS support
- COMPATIBILITY: M.2 NVMe SSD converter adapter is backward compatible with earlier versions of PCIe NVMe drives and fits in standard 2.5" drive bays; Not compatible with SATA or SAS host controllers / Not compatible with M.2 SATA based drives
Full Specifications
| Brand | StarTech.com |
|---|---|
| Color | Red |
| Finish | Pci-e |
| Model Number | U2M2E125 |
| Compatibility | PC |
| Built-In Media | multiport adapter (1), quick-start guide (1) |
| Connector Type | U.2 |
| Item Type Name | M.2. PCI-e NVMe to U.2 Adapter |
| Item Dimensions | 3.9 x 2.8 x 0.3 inches |
| Mfr Part Number | U2M2E125 |
| Number of Items | 1 |
| Number of Ports | 1 |
| Power Plug Type | No Plug |
| HASSLE-FREE SETUP | This M2 to U.2 adapter offers a fast and easy setup with native OS support |
| Compatible Devices | Desktop |
| Warranty Description | 2 Year |
| Smart Home Compatibility | Not Smart Home Compatible |
| Item dimensions L x W x H | 3.9 x 2.8 x 0.3 inches |
| Specific Uses For Product | Business only |
| External Testing Certification | CE, FCC, TAA |
| Full listing title | StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive to U.2 Host Adapter - M2 SSD Converter, TAA |
Ready to buy?
StarTech.com M.2. PCI-e NVMe to U.2 (SFF-8639) Adapter - Not Compatible with SATA Drives or SAS Controllers - For M.2 PCIe NVMe SSDs - PCIe M.2 Drive to U.2 Host Adapter - M2 SSD Converter, TAA is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.
*Price sourced from Amazon.com. Last updated 2026-10-21. Price and availability subject to change.
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