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Green circuit board with gold edge connector and silver U.2 port

SMUGDESK

SMUGDESK SFF-8639 U.2 to PCIe 3.0 x4 Adapter Card

SKU CH-MBJJ-C3F94

Adds a SFF-8639 U.2 NVMe slot to a PCIe 3.0 x4 lane without extra power

  • Adds U.2 NVMe storage through a PCIe 3.0 x4 slot
  • Works without extra power cables, drawing energy from the slot
  • Maintains stable signal quality for dependable long-term use
  • Runs on Windows, Linux and Mac OS without extra drivers
  • Standard card form factor fits desktop and server expansion slots

U.2 NVMe SSD Adapter

This SMUGDESK adapter converts a PCIe 3.0 x4 slot into an SFF-8639 U.2 port for NVMe SSDs. It draws power directly from the slot so no extra cables are needed. The standard expansion card design suits desktop and server storage upgrades. Broad OS support covers Windows, Linux and Mac OS.

PCIe 3.0 x4 Bandwidth Limit

The adapter relies on a PCIe 3.0 x4 connection which caps the maximum throughput of any attached U.2 NVMe SSD. Drives rated for newer interfaces will operate at this lower ceiling. Systems without a free x4 slot cannot use the card at full speed. Ensure the motherboard provides the required lane allocation.

SFF-8639 U.2 Port Requirement

The card only accepts SSDs with an SFF-8639 U.2 connector. M.2 drives or other form factors will not fit without a separate converter. Buyers whose SSDs use a different interface must choose another adapter. Confirm the drive connector type before purchasing.

Highlights

  • Adds U.2 NVMe storage through a PCIe 3.0 x4 slot
  • Works without extra power cables, drawing energy from the slot
  • Maintains stable signal quality for dependable long-term use
  • Runs on Windows, Linux and Mac OS without extra drivers
  • Standard card form factor fits desktop and server expansion slots

Specifications

No published specifications for this item yet.

Questions about this item

Which version of this adapter should I choose for a PCIe 3.0 x4 slot?

This single model converts a PCIe 3.0 x4 slot to an SFF-8639 U.2 port, so it matches that exact interface without needing a different version.

What does the PCIe 3.0 x4 connection deliver when the card is installed in a desktop?

It provides a four-lane PCIe 3.0 link to the U.2 NVMe SSD, letting the drive run at its native speed through the motherboard slot.

Does the SFF-8639 U.2 interface on this card limit the SSD in any way?

The SFF-8639 U.2 port passes the full PCIe 3.0 x4 signal to the NVMe SSD, so the drive's performance is not capped by the adapter itself.

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