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Green circuit board with SFF-8639 connector and gold fingers

JEYI

JEYI U.2 SFF-8639 to PCIe 4.0 x4 adapter

SKU CH-SAT5-KGRKV

Connects a 2.5 inch U.2 NVMe SSD to a PCIe 4.0 x4 slot with 64 Gbps bandwidth and 50 gold-plated fingers

  • Up to 16 GB/s bandwidth via PCIe 4.0 x4
  • Fits 2.5-inch U.2 NVMe SSDs with SFF-8639 connector
  • Works in PCIe 4.0/3.0 x16, x8, x4 slots
  • Cable-free direct mount with 50 gold-plated fingers
  • Plug-and-play on Windows, macOS, Linux

U.2 SFF-8639 adapter for PCIe 4.0 x4 slots

This JEYI adapter connects a 2.5 inch U.2 NVMe SSD to a desktop, workstation or server motherboard. It fits PCIe 4.0, 3.0 x16, x8 or x4 slots and works with Windows, macOS and Linux without extra drivers. The built-in full-height bracket allows direct, cable-free installation inside the case.

Bandwidth up to 64Gbps and 16GB/s theoretical

PCIe 4.0 x4 provides up to 64Gbps throughput, reaching a theoretical 16GB/s for large file transfers and 4K or 8K video workloads. The link runs at PCIe 3.0 speeds when installed in a 3.0 slot, so older platforms still function but with reduced headroom. The adapter is not hot-swappable, so power down before swapping drives.

Gold-plated fingers for stable contact

Fifty gold-plated fingers improve conductivity and resist oxidation for long-term signal stability. The direct SFF-8639 connector eliminates extra cables, reducing clutter and potential failure points. No active cooling is included, so airflow in the chassis determines thermal performance under sustained loads.

Highlights

  • Up to 16 GB/s bandwidth via PCIe 4.0 x4
  • Fits 2.5-inch U.2 NVMe SSDs with SFF-8639 connector
  • Works in PCIe 4.0/3.0 x16, x8, x4 slots
  • Cable-free direct mount with 50 gold-plated fingers
  • Plug-and-play on Windows, macOS, Linux

Specifications

No published specifications for this item yet.

Questions about this item

Will the adapter fit my older PCIe 3.0 x16 slot?

Yes, it works in PCIe 3.0 x16, x8 and x4 slots as well as PCIe 4.0 slots.

How can I verify the card is running at the full 64Gbps link speed?

Check the negotiated link width and speed in your OS device manager or with a tool such as lspci; it should show x4 and Gen 4.0.

Does the package include a U.2 drive or any extra cables?

Only the adapter card with a full-height bracket and the SFF-8639 connector are included; the 2.5 inch U.2 NVMe SSD must be purchased separately.

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