StarTech.com 4 Port USB 3.0 PCIe Card with 2 Dedicated Channels - UASP

StarTech.com PEXUSB3S42V

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Manufacturer Part#  PEXUSB3S42V

UPC Code: 065030854597

Provantage Code:  STR939H

Condition:  Factory New

  • Product Type: USB Adapter
  • Limited Warranty: 2 Year
  • Host Interface: PCI Express x4
  • Form Factor: Plug-in Card
  • Length: 6.6"
  • TAA Compliant: No

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StarTech.com PEXUSB3S42V Specifications

    4 Port USB 3.0 PCIe Card with 2 Dedicated Channels - UASP

At a Glance

    Rear View
    • Provides four external, USB 3.2 Gen 1 Ports on two independent bus channels
    • Supports up to 10 Gbps total transfer bandwidth - Up to 5 Gbps per two ports
    • UASP support across all four ports
    • PCIe x4 interface compliant with PCI Express 2.0 specifications
    • Optional LP4 or SATA power connector provides up to 900mA per USB port
    • Supports USB Battery Charging Specification 1.2 (Apple Mode only)
    • 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
    • Hot-swap feature to connect/disconnect devices without powering down the system


    The PEXUSB3S42V 4-Port PCI Express USB 3.2 Gen 1 Card lets you add four USB 3.2 Gen 1 ports with two dedicated 5 Gbps channels to your PCIe x4-enabled PC. This independent port architecture improves USB 3.2 Gen 1 performance by transferring data on two individual channels to your computer, giving you faster file transfers.

    When multiple devices are connected, traditional single bus USB 3.2 Gen 1 cards share your maximum bandwidth between all ports. By employing a second host controller chipset, the transmission channel is shared across two ports rather than four. Dedicating up to 5 Gbps for each set of two ports reduces performance bottlenecks, and effectively doubles your total available to bandwidth to 10 Gbps.

    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 requires a compatible operating system). 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.

    For high-power USB devices, this PCIe USB 3.2 Gen 1 card includes an optional SATA or 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). The USB 3.2 Gen 1 card also supports USB Battery Charging Specification 1.2 (Apple Mode only), letting you charge compatible Apple devices (iPhones and iPads) faster than a standard USB 3.2 Gen 1 port.

    The controller card is compliant with USB 3.2 Gen 1 standards while offering backward compatibility with existing USB 2.0 / 1.1 devices. For added versatility, the USB 3.2 Gen 1 PCIe 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.

    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.

    More from the Manufacturer

Package Contents

    • 4 Port PCIe USB Card
    • 1 x Low Profile Bracket
    • 1 x Driver CD
    • 1 x Instruction Manual

Additional Product Images


Product Name4 Port USB 3.0 PCIe Card with 2 Dedicated Channels - UASP
Manufacturer Part NumberPEXUSB3S42V
Product TypeUSB Adapter
Total Number of USB Ports4
Product ColorBlack
Form FactorPlug-in Card
Host InterfacePCI Express x4
Environmentally FriendlyYes
Number of SATA Ports1
UASP SupportYes
Number of USB 3.2 Ports4
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 PEXUSB3S42V

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

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StarTech.com USB 3.0 to SATA or IDE Hard Drive Adapter Converter


The Following Are Compatible With StarTech.com PEXUSB3S42V

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