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StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD, SFF-8639, TAA | OS… competes with other Graphics & Video products on SpecPicks. Use our Compare tool to view specs side-by-side, or browse the full Graphics & Video category for alternatives.

StarTech.com

StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD, SFF-8639, TAA | OS independent, For NVMe U.2/U.3 drives only, Up to 15mm height, Vented full-profile bracket, SATA/SAS not supported

Name: StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD, SFF-8639, TAA | OS independent, For NVMe U.2/U.3 drives only, Up to 15mm height, Vented
Brand: StarTech.com
SKU: B072JK2XLC
Price: 33.34 USD
Availability: InStock

By Mike Perry, Hardware Editor · Verified 2026-09-06

Mike Perry has researched PC hardware since 2014, tracking 80+ GPU generations, 50+ retro handheld platforms, and 30+ vintage PC configurations. He synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides. View full credentials →

$33.34

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*Price sourced from Amazon.com. Last updated 2026-04-19. Price and availability subject to change.

Bottom line: The StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD, SFF-8639, TAA | OS independent, For NVMe U.2/U.3 drives only, Up to 15mm height, Vented full-profile bracket, SATA/SAS not supported is a niche pick — read recent reviews before buying in the graphics & video category, priced around $33.34. Compare close alternatives before committing.

SpecPicks Verdict

SpecPicks scored StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD… using a rating × review-volume × price-fit model applied to our editorial and benchmark analysis across the graphics & video category. StarTech.com's graphics & video lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Mixed or limited buyer feedback at this price point — focus your evaluation on recent reviews that specifically address build quality and long-term reliability, and shortlist one or two close alternatives before deciding.

Common buyer scenarios for graphics & video 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 Amazon listing before purchase. Prices, stock, and Prime eligibility update directly from Amazon's catalog and may have moved since this page was last verified.

Pros & Cons

Pros

✓ Backed by StarTech.com's warranty and support channels
✓ Ships via Amazon with Prime eligibility and the standard returns policy

Cons

✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
✗ Price, stock, and Prime eligibility update from Amazon and may have changed since this page was last verified

Key Features

HIGH PERFORMANCE U.2 STORAGE: Add a 2.5 inch U.2 NVMe SSD into a PCIe 4.0 x4/x8/x16 slot in a desktop or server, enabling ultra-fast data access; Supports SFF-8639 drives up to 15mm in height; For NVMe U.2/U.3 drives only; SATA/SAS protocols not supported
UNIVERSAL COMPATIBILITY: Backwards compatible with PCI Express 3.0 motherboards that have an available x4, x8, or x16 PCIe slot; U.2 Adapter works with all workstation and server operating systems such as Windows, Windows Server, and Linux
PREVENT OVERHEATING: Vented full-profile bracket and a large cutout in the PCB allow for better airflow and heat dissipation, which helps maintain optimal and reliable performance while reducing potential thermal throttling
HASSLE-FREE SETUP: Pre-installed full-profile bracket & included drive mounting screws enable the connection of a U.2 drive to a PCIe slot, without the need of a drive backplane or additional cables; The U.2 to PCIe Card requires no drivers or software
THE IT PRO'S CHOICE: Designed and built for IT Professionals, this U.2 to PCI Express Adapter Card is backed for two years, including free lifetime 24/5 multi-lingual technical assistance

Full Specifications

Brand	StarTech.com
Style	U2 to PCIe
Style Name	U2 to PCIe
Unit Count	1 Count
Model Number	PEX4SFF8639
Compatibility	Linux
Built-In Media	drive adapter card (1), drive-mounting screws (4), quick-start guide (1)
Item Type Name	U.2 to PCI Express Adapter
Mfr Part Number	PEX4SFF8639
Compatible Devices	The U.2 to PCIe adapter is compatible with PCIe 3.0 motherboards and is also backward compatible with PCIe 2.0 and PCIe 1.0.
Hardware Interface	PCI
Warranty Description	2 Years
Item Dimensions L x W x H	6.5"L x 4.8"W x 0.9"H
Global Trade Identification Number	00065030872591

Ready to buy?

StarTech U.2 to PCIe 4.0 x4 Adapter for 2.5in U.2 NVMe SSD, SFF-8639, TAA | OS independent, For NVMe U.2/U.3 drives only, Up to 15mm height, Vented full-profile bracket, SATA/SAS not supported is sold on the used and vintage market, where eBay carries the live inventory — Amazon does not stock this part. Prices and condition vary by seller and move in real time, so we link the live listing rather than quote a cached price. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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*Price sourced from Amazon.com. Last updated 2026-04-19. Price and availability subject to change.