U.2 to PCIe Adapter for 2.5" U.2 NVMe SSD - SFF-8639 - x4 PCI Express 3.0

Mount a 2.5" U.2 NVMe SSD into your desktop computer or server, using an available PCIe expansion slot

Product ID: PEX4SFF8639

3 stars (2 reviews) |
  • Boost system speed and performance by adding a PCIe NVMe U.2 SSD to your PC
  • Simplify system builds with a U.2 to PCIe adapter that mounts your SSD directly to the adapter, with no need for adapter cables
  • PCI Express 3.0 x4 lane host adapter
Your price
$99.99 AUD excl. GST
$109.99 AUD incl. GST

Get ultra-fast data access by adding an NVMe U.2 SSD to your computer. This U.2 to PCIe adapter lets you add a high-speed, U.2 (4-lane PCIe) 2.5" NVMe SSD, such as the Intel® 750 Series drive, to a PC with an available x4 PCI Express expansion slot.

You can mount the PCIe U.2 drive directly onto the adapter, giving you an easy and convenient way to improve your system performance and expand overall internal storage.

Boost your system speed and performance

The expansion card lets you take full advantage of the fast performance and compact size of PCIe U.2 internal solid-state drives. The adapter connects directly to your computer motherboard to support an NVMe U.2 PCIe-based SSD through ultra-fast x4 PCIe. With the U.2 PCIe-based drive in place, the adapter gives your computer a significant speed boost.

Easy to install

The expansion card is equipped with a full-profile bracket and doesn’t require an adapter cable for installation, this helps to reduce clutter and simplifies system builds. The drive connects directly to the SFF-8639 connector on the adapter, and the adapter connects directly to the computer motherboard.

The adapter is compatible with PCIe 3.0 motherboards and is also backward compatible with PCIe 2.0 and PCIe 1.0.

The PEX4SFF8639 is backed by a StarTech.com 2-year warranty and free lifetime technical support.


  • Upgrade your data-center or enterprise-level applications with U.2 NVMe SSD capability
  • Utilize the advanced performance of a PCIe U.2 NVMe 2.5 in. SSD for intensive data workloads
  • Work with large files more efficiently for audio/video production and editing
  • Enhance productivity for data-heavy applications, ideal for developers and content creators

Partner Numbers

  • Dicker Data Australia PEX4SFF8639
  • Ingram Micro Australia 3695956
  • UPC 065030872591


  • OS Independent logo
OS independent; No software or drivers required


Warranty Information Warranty 2 Years
Connector(s) 1 - Drive Connectors U.2 (PCIe, NVMe, SFF-8639)
1 - Host Connectors PCI Express x4
Environmental Operating Temperature 5°C to 50°C (41°F to 122°F)
Storage Temperature -25°C to 70°C (-13°F to 158°F)
Humidity 15% ~ 90% RH
Hardware Interface PCI Express
Bus Type PCI Express
Number of Drives 1
Drive Size 2.5in
Compatible Drive Types U.2 (PCIe, NVMe, SFF-8639)
Drive Installation Fixed
Supported Drive Height(s) 15mm
Fan(s) No
Indicators 1 - LED Indicators Activity Terminal/Header
Packaging Information Shipping (Package) Weight 5.7 oz [161 g]
Package Length 8.7 in [22 cm]
Package Width 6.3 in [16 cm]
Package Height 1.8 in [45 mm]
Performance Hardware Raid Supported No
Hot Swap Capability No
Physical Characteristics Color Red
Material Steel
Product Length 6.5 in [16.5 cm]
Product Width 4.8 in [12.2 cm]
Product Height 0.9 in [2.2 cm]
Weight of Product 2.3 oz [65 g]
Software OS Compatibility OS independent; No software or drivers required
What's in the Box 1 - Included in Package drive adapter card
quick-start guide
4 - Included in Package drive-mounting screws


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Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(2 reviews)
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1 - 2 of 2 Reviews
(1 Stars)

needs drivers, and there are no drivers

By: hmficn - 05/18/2021
Under drivers it gives you a PDF that says, you might need drivers. But there are no drivers to download... Go figure.
| Helpful?
Dan, Customer Support on 19/05/2021 7:29:03 AM
Our apologies for the confusion. The drivers referred to in the manual are for the U.2 drive or motherboard, as your board or drive may require drivers before they will work properly together. The PEX4SFF8639 itself does not require any drivers or software to be installed.
(5 Stars)

Perfect solution

By: bumperdoo - 08/06/2021
Used to mount Optane P5800x drives to MOBOs - perfect solution. You don't need drivers for the AIC itself.
| Helpful?
By: Satoshi - 11/18/2021
Will it work as a pcie v.4 adapter? Or the speed will be as for pcie v3?
| Helpful?
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