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Green circuit board with silver U.2 connector and PCIe gold fingers

SMUGDESK

SMUGDESK IO-PCE8639A-U2 PCIe 4.0 x4 to U.2 SFF-8639 7000MB/s Adapter

SKU CH-R3HQ-MJRZC

Adds a U.2 SFF-8639 port for 2.5" NVMe SSDs via PCIe 4.0 x4, reaching 7000MB/s without extra power cables

  • PCIe 4.0 x4 delivers up to 7000 MB/s throughput
  • U.2 SFF-8639 port fits 2.5 inch NVMe SSD
  • Bus powered design removes need for extra power cables
  • Plug and play operation works without driver installation
  • Compatible with servers and workstations for storage expansion

PCIe 4.0 x4 to U.2 Adapter

This SMUGDESK expansion card converts a PCIe 4.0 x4 slot into a U.2 SFF-8639 port for 2.5 inch NVMe SSD installation. It delivers transfer speeds up to 7000MB/s and draws power directly from the bus, removing the need for extra cables. The plug-and-play design works without additional drivers on mainstream operating systems. It targets server and workstation builders who want fast enterprise storage expansion.

Suits U.2 NVMe SSD upgrades

The card fits administrators adding 2.5 inch U.2 NVMe drives to servers or workstations with a free PCIe 4.0 x4 slot. It is not for buyers who need M.2 drive support or who lack a compatible PCIe slot. Systems without PCIe 4.0 x4 bandwidth will not reach the stated speed ceiling. The bus-powered design also means no external power connector is required.

7000MB/s via PCIe 4.0 x4

The single specification that decides fit is the 7000MB/s ceiling over a PCIe 4.0 x4 link to a U.2 SFF-8639 device. If the host slot negotiates at an older PCIe generation the throughput drops accordingly. Verify the motherboard or riser provides a full x4 electrical connection for the advertised rate.

How it compares

Measured against everything we stock in SATA, IDE & M.2 Drive Adapters, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 65% of the 1,721 comparable items (median $22.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the SMUGDESK IO-PCE8639A-U2 in my server and what step is often missed?

Insert the card into a PCIe 4.0 x4 slot, attach the 2.5 inch U.2 NVMe SSD to the SFF-8639 port, and secure it; the step often missed is confirming the motherboard BIOS detects the drive before booting the OS.

What maintenance or replacement will this adapter need over time?

The adapter has no moving parts and draws power from the slot, so it requires no scheduled maintenance; only the connected NVMe SSD may eventually need replacement after heavy write cycles.

What is the first limit I will hit under sustained heavy transfers?

The PCIe 4.0 x4 interface caps throughput at 7000MB/s, so sustained sequential workloads will hit that bandwidth ceiling before the card itself becomes a bottleneck.

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