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Green circuit board with gold edge connector and silver U.2 socket, four small mounting screws beside it

STARTECH

STARTECH PEX4SFF8639 U.2 to PCIe expansion card

SKU CH-Z9R6-AXVF2 MPN PEX4SFF8639

Adds a 2.5in U.2 NVMe SSD to a PC or server through a PCI Express 3.0 x4 slot

  • TypeU.2 to PCIe Adapter - x4 PCIe
  • SpecificationsBus Type: PCI Express Compatible Drive Types: U.2 (SFF-8639,
  • FeaturesU.2 to PCIe Adapter - x4 PCIe - For 2.5" U.2 NVMe SSD - SFF-
  • Dimensions0.90" x 6.50" x 4.80"
  • Weight0.14 lbs.
  • Package Contents1 - drive adapter card 4 - drive-mounting screws 1 - quick-s
  • Mount a 2.5" U.2 NVMe SSD directly into a PCIe slot
  • Add high-speed NVMe storage without cables using the fixed-mount design
  • Works with PCIe 3.0 x4 and 2.0 motherboards for broad compatibility
  • Supports drive heights from 5 mm to 15 mm for flexible SSD choice
  • Compact card measures 0.90" x 6.50" x 4.80" and weighs 0.14 lbs.

U.2 NVMe PCIe Adapter

The StarTech PEX4SFF8639 is a PCI Express 3.0 x4 expansion card that lets you install a single 2.5in U.2 NVMe SSD into any desktop or server with a free PCIe slot. It targets system builders and IT professionals who need enterprise-grade U.2 storage without a dedicated backplane or drive bay.

Fixed Mount, Direct Connection

The card holds the SSD in a fixed position using the included screws, supporting drive heights of 5mm, 7mm, 9.5mm, 12.5mm and 15mm. This design removes the need for separate adapter cables, simplifying cable routing inside the chassis and reducing potential connection points.

Passive Thermal Design

With no onboard fan or active cooling, the adapter relies entirely on case airflow to manage SSD temperatures. Power draw is limited to the drive itself, adding negligible load to the PCIe slot and keeping acoustic output at zero during normal operation.

Points forts

  • Mount a 2.5" U.2 NVMe SSD directly into a PCIe slot
  • Add high-speed NVMe storage without cables using the fixed-mount design
  • Works with PCIe 3.0 x4 and 2.0 motherboards for broad compatibility
  • Supports drive heights from 5 mm to 15 mm for flexible SSD choice
  • Compact card measures 0.90" x 6.50" x 4.80" and weighs 0.14 lbs.

Caractéristiques

BrandStarTech.com
ModelPEX4SFF8639
TypeU.2 to PCIe Adapter - x4 PCIe
SpecificationsBus Type: PCI Express
Compatible Drive Types: U.2 (SFF-8639, x4 PCIe, NVMe)
Drive Installation: Fixed
Drive Size: 2.5in
Interface : PCI Express
Number of Drives: 1
Supported Drive Height(s):
15mm
12.5mm
9.5mm
7mm
5mm
FeaturesU.2 to PCIe Adapter - x4 PCIe - For 2.5" U.2 NVMe SSD - SFF-8639 PCIe Adapter - U.2 SSD - PCIe SSD - U.2 drive
Dimensions0.90" x 6.50" x 4.80"
Weight0.14 lbs.
Package Contents1 - drive adapter card
4 - drive-mounting screws
1 - quick-start guide
Poids d’expédition0.16 kg
Dimensions du colis218 × 157 × 48 mm

Questions sur cet article

What PCIe version and lane width does the PEX4SFF8639 use, and what throughput does that cap at?

The card runs at PCIe 3.0 x4, so the drive is limited to the bandwidth of a 3.0 x4 link.

Which drive heights and screw pattern does the adapter accept for a 2.5in U.2 SSD?

It supports 5mm, 7mm, 9.5mm, 12.5mm and 15mm drives and includes four mounting screws for the fixed installation.

How is the SSD attached to the card, and what step is often missed during installation?

The drive mounts directly onto the adapter with the supplied screws; a common mistake is leaving the drive unsecured before seating the card in the PCIe slot.

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