StarTech.com 2 Port PCI Express (PCIe) USB 3.0 Card with UASP - LP4 Power

StarTech.com PEXUSB3S25

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Manufacturer Part#  PEXUSB3S25

UPC Code: 065030854603

Provantage Code:  STR936F

Condition:  Factory New

  • Product Type: USB Adapter
  • Limited Warranty: 2 Year
  • Host Interface: PCI Express x1
  • Form Factor: Plug-in Card
  • Length: 3.2"
  • TAA Compliant: No

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StarTech.com PEXUSB3S25 Specifications

    2 Port PCI Express (PCIe) USB 3.0 Card with UASP - LP4 Power

At a Glance

    Rear View
    • Provides two external USB 3.2 Gen 1 ports with UASP support
    • Supports data rates up to 5 Gbps
    • Compliant with PCI Express 2.0 specifications
    • Optional LP4 power connector provides up to 900mA per USB port
    • Supports USB Battery Charging Specification 1.2
    • Fully compliant with USB 3.2 Gen 1 rev 1.0 and Intel xHCI rev 1.0 specifications
    • Backward compatible with USB 2.0 and USB 1.0/1.1 devices
    • Includes a Low-Profile/half-height installation bracket


    The PEXUSB3S25 2-Port PCI Express USB 3.2 Gen 1 Card lets you add two USB 3.2 Gen 1 ports to your PCI Express-enabled computer system, with an optional LP4 power connector to connect to your system power supply and deliver up to 900mA of power per port to USB 3.2 Gen 1 bus-powered devices (500mA for USB 2.0).

    Enhanced with UASP support (USB Attached SCSI Protocol), this USB 3.2 Gen 1 controller performs up to 70% faster than conventional USB 3.2 Gen 1 when paired with a (Note: UASP is not supported by all operating systems). Using a more efficient protocol than the traditional USB BOT (Bulk-Only Transport), UASP technology optimizes transfers by allowing multiple commands to be processed simultaneously, significantly increasing transfer speeds for less wait time on data transfers. See our UASP test results below for further details.

    The PCIe USB 3.2 Gen 1 adapter is compliant with USB 3.2 Gen 1 standards for data transfer speeds up to 5 Gbps, while still offering backward compatibility with existing USB 2.0 / 1.1 devices. For added versatility, the controller card is equipped with a standard profile bracket and includes a low-profile/half- height bracket for installation in small form-factor computers.

    Backed by a StarTech.com 2-year warranty and free lifetime technical support.

    UASP is supported in Windows 8, 8.1, Server 2012 and Linux kernel 2.6.37 or later. In testing UASP performed with up to a 70% faster read / 40% faster write speed over traditional USB 3.2 Gen 1 at peak performance.

    At the same peak in testing, UASP also showed up to an 80% reduction in required processor resources.

    Test results were obtained using an Intel Ivy Bridge system, StarTech.com add-on USB 3.2 Gen 1 cards, a UASP-enabled StarTech.com enclosure, and a SATA III solid state drive.

    More from the Manufacturer


    OS Compatibility:

    • Windows® Vista, 7, 8, 8.1, 10
    • Windows Server® 2008 R2, 2012, 2012 R2, 2016, 2019
    • Linux 2.6.31 to 4.11.x LTS versions only

Package Contents

    • 2 Port PCI Express PCIe SuperSpeed (5Gbps) USB 3.0 Card Adapter with UASP
    • 1 x Low Profile Bracket
    • 1 x SATA to LP4 Cable
    • 1 x Driver CD
    • 1 x Instruction Manual

Additional Product Images


Product Name2 Port PCI Express (PCIe) USB 3.0 Card with UASP - LP4 Power
Manufacturer Part NumberPEXUSB3S25
Product TypeUSB Adapter
Total Number of USB Ports2
Product ColorBlack
Form FactorPlug-in Card
Host InterfacePCI Express x1
Environmentally FriendlyYes
UASP SupportYes
Number of USB 3.2 Ports2
Country of OriginChina
Operating System SupportedWindows Vista

Windows 7

Windows 8

Windows 8.1

Windows 10

Windows 11

Windows Server 2008 R2

Windows Server 2012

Windows Server 2016

Windows Server 2019

Packaged Quantity1
Platform SupportedPC


Limited Warranty2 Year
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Supplies/Accessories for StarTech.com PEXUSB3S25

StarTech.com Black SuperSpeed USB 3.0 Cable A to B 10 ft - M/M

Mfg Part# USB3SAB10BK

StarTech.com Black SuperSpeed USB 3.0 Cable A to B 6 ft - M/M

Mfg Part# USB3SAB6BK

The Following Are Compatible With StarTech.com PEXUSB3S25

StarTech.com 4 Port USB 3.0 Hub plus 3 Dedicated Charging Ports

Mfg Part# ST4300U3C3

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Purchase a minimum of $3,000 of StarTech Products

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