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Startech Pexusb3s42v 4 Port Dual Bus Pcie Usb 3 Card W/ Uasp - PS2 - Cables - COMPUTER HARDWARE

Startech Pexusb3s42v 4 Port Dual Bus Pcie Usb 3 Card W/ Uasp


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Retail Price $168
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SKU#: PEXUSB3S42V / ITEM NO: 570252 / BRAND: Startech
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4 Port Dual Bus PCI Express (PCIe) SuperSpeed USB 3.0 Card Adapter with UASP - SATA/LP4 Power - Quad Port USB 3.0 PCIe Controller - Dual Bus USB 3.0 PCI Express Card - Dual Profile

Startech Pexusb3s42v 4 Port Dual Bus Pcie Usb 3 Card W/ Uasp

Product Overview

The PEXUSB3S42V 4-Port PCI Express USB 3.0 Card lets you add four USB 3.0 ports with two dedicated 5 Gbps channels to your PCIe x4-enabled PC. This independent port architecture improves USB 3.0 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 3.0 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 3.0 controller performs up to 70% faster than conventional USB 3.0 when paired with a UASP supported enclosure (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 3.0 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 3.0 bus-powered devices (500mA for USB 2.0). The USB 3.0 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 3.0 port.

The controller card is compliant with USB 3.0 standards while offering backward compatibility with existing USB 2.0 / 1.1 devices. For added versatility, the USB 3.0 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 2-year warranty and free lifetime technical support.

Improved Performance with UASP

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 3.0 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, add-on USB 3.0 cards, a UASP-enabled enclosure, and a SATA III solid state drive.

Product Specifications

Warranty Information


2 Years

Physical Characteristics

Product Height

4.7 in [120 mm]

Product Length

6.6 in [167 mm]

Product Weight

3.2 oz [90 g]

Product Width

0.6 in [15 mm]


Bus Type

PCI Express

Card Type

Standard Profile (LP bracket incl.)

Chipset ID

2 x Renesas / NEC - µPD720202

Industry Standards

USB 3.0 Specification Rev. 1.0 USB Battery Charging Specification Rev. 1.2 (Apple Mode only) PCI Express Base Specification Rev. 2.0 Intel xHCI Specification Rev. 1.0


USB 3.0

Port Style

Integrated on Card




Maximum Cable Length

9.8 ft [3 m]

Maximum Data Transfer Rate

5Gbps per 2 ports - 10Gbps Total

Type and Rate

USB 3.0 - 5 Gbit/s

UASP Support



Connector Type(s)

1 - PCI Express x4 Male

External Ports

4 - USB 3.0 A (9 pin; SuperSpeed) Female

Internal Ports

1 - LP4 (4 pin; Molex Large Drive Power) Female


1 - SATA Power (15 pin) Plug


OS Compatibility

Windows 10 (32/64), 8 / 8.1 (32/64), 7 (32/64), Vista (32/64), XP (32/64) Windows Server 2012, 2008 R2, 2003 Linux 2.6.31 or later

Special Notes / Requirements

System and Cable Requirements

Available PCI Express x4 or greater slot



5~85% RH

Operating Temperature

0°C to 50°C (32°F to 122°F)

Storage Temperature

-20°C to 60°C (-4°F to 140°F)

Packaging Information

Shipping (Package) Weight

7.1 oz [200 g]

What's in the Box

Included in Package

1 - 4 Port PCIe USB Card


1 - Low Profile Bracket


1 - Driver CD


1 - Instruction Manual

Brand StarTech
Dimension Product Height 4.7 in [120 mm]
Product Length 6.6 in [167 mm]
Product Width 0.6 in [15 mm]
Ports 4
Interface USB 3.0
Speed Super Speed
Manufacturer Warranty
1 Year Return to Base Warranty
Manufacturer Contact Info

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For IMMEDIATE customer service assistance or help with an order please call our Customer Service Team on: 02 9011 2078
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