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PCIe 4.0 M.2 to U.2 SFF-8639 Cable, Left Exit | PCIe Gen4 x4 Lanes, 15Pin SATA Power Supply, 1.6ft (50cm), for NVMe SSD, Server, Backplane, Motherboard,Workstation
LetLinkSo

LetLinkSo PCIe 4.0 M.2 to U.2 SFF-8639 Cable

Bottom line: The LetLinkSo PCIe 4.0 M.2 to U.2 SFF-8639 Cable is a specs-and-price decision rather than a crowd-consensus one in the storage adapters category. Check the specification table below against one or two close alternatives — on price and spec fit, not on star ratings.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

Pros & Cons

Pros

  • ✓ Backed by LetLinkSo's warranty and support channels

Cons

  • ✗ Confirm socket / form-factor / power-rating compatibility against your build before ordering
  • ✗ Price, stock, shipping and returns are set by the retailer and may have changed since this page was last updated

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SpecPicks Verdict

SpecPicks scored LetLinkSo PCIe 4.0 M.2 to U.2 SFF-8639 Cable using a rating × review-volume × price-fit model applied to published specs and reviews across the storage adapters category. LetLinkSo'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.

Key Features

  • ENHANCED SYSTEM PERFORMANCE: This PCIe Gen4 M.2 to U.2 adapter makes it easy to install an U.2 PCIe NVMe SSD into your desktop PC or server, and connect to the drive through an available M.2 2280 M key compatible interface on your motherboard
  • PCIE 4.0 SPEEDS: Experience cutting-edge performance with support for PCIe4.0, delivering theoretical speeds of up to 64 Gbps for your U.2 NVMe SSD
  • EFFORTLESS INSTALLATION: This U.2 to M.2 adapter is ready to use out of the box, with no drivers or software required
  • BACKWARD COMPATIBILITY: Future-proof yet flexible, this M.2 to SFF8639 adapter is designed for the latest technologies but also ensures compatibility with PCIe 3.0, 2.0, and 1.0 devices, providing users with the freedom to upgrade at their own pace
  • IMPORTANT: This adapter requires connection to a SATA power cable to function. While the M.2 PCB of this PCIe 4.0 adapter shares the same design as the PCIe 5.0 version, it is still designed to operate at PCIe 4.0 speeds.

Full Specifications

BrandLetLinkSo
ColorBlack&Blue
ModelLeft Exit
Cable TypePCIe 4.0 \ SAS
Model NameHigh-Speed M.2 to U.2 Cable
Item Length1.6 feet
Part NumberLLS-CB-1MT1UT-02
CompatibilityPC
Connector TypeM.2 M Key 2280, Straight Sff-8639 U.2
Number of Pins22
Outer MaterialNylon, Polybutylene Terephthalate(PBT), Polyvinyl Chloride (PVC)
Number of Items1
PCIE 4.0 SPEEDSExperience cutting-edge performance with support for PCIe4.0, delivering theoretical speeds of up to 64 Gbps for your U.2 NVMe SSD
Special FeatureBackward Compatibility, Custom OEM/ODM and Bulk Supply, Effortless Installation, Enhanced System Performance, PCIe 4.0 Speed
Connector GenderMale-to-Male
Specification MetRoHS
Compatible DevicesBackplane, Motherboard, SSD, Server, Workstation
Data Transfer Rate64 gigabits_per_second
Included ComponentsPCIe 4.0 M.2 to U.2 Adapter x 1
Indoor Outdoor UsageIndoor
Full listing titlePCIe 4.0 M.2 to U.2 SFF-8639 Cable, Left Exit | PCIe Gen4 x4 Lanes, 15Pin SATA Power Supply, 1.6ft (50cm), for NVMe SSD, Server, Backplane, Motherboard,Workstation

Ready to buy?

PCIe 4.0 M.2 to U.2 SFF-8639 Cable, Left Exit | PCIe Gen4 x4 Lanes, 15Pin SATA Power Supply, 1.6ft (50cm), for NVMe SSD, Server, Backplane, Motherboard,Workstation 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.

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PCIe 4.0 M.2 to U.2 SFF-8639 Cable, Left Exit | PCIe Gen4 x4 Lanes, 15Pin SATA Power Supply, 1.6ft (50cm), for NVMe SSD, Server, Backplane, Motherboard,Workstation
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