4 Port SuperSpeed USB 3.0 PCI Express Card with UASP - SATA Power

Add 4 USB 3.0 ports to your desktop computer through a PCI Express expansion slot

Product ID: PEXUSB3S4

  • Adds four USB 3.0 ports in total; 3x External, 1x Internal
  • Fully compliant with USB 3.0 revision 1.0 specifications and Intel xHCI rev0.95 specifications, with transfer rates up to 5 Gbps
  • UASP support for more efficient data transfer
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  • Built-in optional SATA power connector for bus-powered USB devices
  • Optionally provides up to 900mA per USB port
  • Backward compatible with USB 2.0 and USB 1.0/1.1 devices
  • Compliant with PCI Express 2.0 specifications
  • Includes a Low Profile/half-height installation bracket
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The PEXUSB3S4 4-Port PCI Express SuperSpeed USB 3.0 Card (with SATA Power) adds 3 external USB 3.0 ports and an internal USB 3.0 port to any PCI Express-enabled computer system. With SuperSpeed USB 3.0, you can reach data transfer speeds up to 5 Gbps, while still being backward compatible with existing USB 2.0 devices at 480Mbps.

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.

With a built-in SATA power connector, each USB port can provide up to 900mA of power to USB 3.0 devices (500mA for USB 2.0) by connecting to your computer power supply. 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 2-year warranty and free lifetime technical support.

Improved Performance with UASP

UASP is supported in Windows® 8, Server 2012 and Linux kernel 2.6.3 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.

UASP Speed Diagram

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

UASP Speed Diagram

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.

The Advantage

  • SuperSpeed USB 3.0 connectivity at up to 5 Gbps and 80% more power than USB 2.0
  • Fit into standard or low profile systems, with a dual profile design
  • Ensure sufficient power for your USB devices with the integrated SATA power connector


Upgrade an older PCIe-based system with USB 3.0 connectivity, to fully utilize USB 3.0 devices

Ideal for newer computer systems with only SATA power connectors, or a limited number of older LP4 power connectors

Expand a system's USB capabilities with three additional external USB ports

Connect additional external hard drives, CD/DVD drives, MP3 players, printers, scanners, webcams, game controllers, digital cameras, etc. to a computer system through USB 3.0

Technical Specifications

Warranty Information
Warranty 2 Years
Bus Type PCI Express
Card Type Standard Profile (LP bracket incl.)
Chipset ID Texas Instruments - TUSB7340
Interface USB 3.0
Ports 4
Maximum Data Transfer Rate 5 Gbps
UASP Support Yes
Connector Type(s) 1 - PCI Express x1 Male
External Ports 3 - USB Type-A (9 pin) USB 3.0 Female
Internal Ports 1 - SATA Power (15 pin) Plug
1 - USB Type-A (9 pin) USB 3.0 Female
OS Compatibility Windows® 8 / 8.1 (32/64bit), 7 (32/64), Vista (32/64), XP (32/64)
Windows Server® 2012, 2008 R2, 2003
Linux 3.5
Special Notes / Requirements
Note The maximum throughput of this card is limited by the bus interface. If used with PCI Express Gen 1.0 enabled computers, the max throughput is 2.5 Gbps. If used with PCI Express Gen 2.0 enabled computers, the max throughput is 5 Gbps.
System and Cable Requirements Available PCI Express expansion slot
Humidity 20% ~ 80% RH
Operating Temperature 5°C to 50°C (41°F to 122°F)
Storage Temperature -25°C to 70°C (-13°F to 158°F)
Physical Characteristics
Product Height 22 mm [0.9 in]
Product Length 90 mm [3.5 in]
Product Weight 60 g [2.1 oz]
Product Width 70 mm [2.8 in]
Packaging Information
Shipping (Package) Weight 190 g [6.7 oz]
What's in the Box
Included in Package 1 - PCI Express USB 3.0 card
1 - Low Profile Bracket
1 - Driver CD
1 - Instruction Manual


View full OS compatibility
Windows® 8 / 8.1 (32/64bit), 7 (32/64), Vista (32/64), XP (32/64)
Windows Server® 2012, 2008 R2, 2003
Linux 3.5


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4 Port SuperSpeed USB 3.0 PCI Express Card with UASP - SATA Power

Customer Reviews

5 (5 reviews)
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1 - 5 of 5 Reviews

(5 stars) Excellent Card!

Have used this card since March 2013 - been working great for 2 years and 5 months. No problems. I use USB 2.0 and USB 3.0 devices on it all the time, plus a variety of different flash drives that are mostly USB 2.0. It's fast with the USB 3.0 stuff, and does great with the 2.0 as well. Would get this card again in a heartbeat. Using it under Win 7 x64 in a PCI-e x8 slot (with x4 link).
Quality of Product (5/5)
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(5 stars) It just works!!!

After careful consideration, I purchased a different USB 3.0 card, primarily because of the price. It didn't work so I returned it and purchased this Startech card. This card is Windows 8.1 compatible and worked as soon as I installed it. I did not install with the included CD, I just downloaded the most recent drivers from MicroCenter will match online prices so look into that. Overall, it just works!
Quality of Product (5/5)
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(5 stars) Works Great!

Easy to install, runs perfectly. Allowed the four ports in the front and powered too.
Quality of Product (5/5)
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(5 stars) Rock solid Windows 7 support

This card uses the TI (Texas Instruments) USB controller rather than the NEC one which almost everything else has. I got two cards with NEC chips in, and my experience with their Windows 7 drivers was very frustrating. These worked first time and flawlessly since.
Quality of Product (5/5)
Comment Helpful? Yes - 1 No - 0 Report

(5 stars) Great for Linux Mint

I'm running Linux Mint on a Dell Inspiron Core 2 Duo. I bought this USB 3.0 express card about three weeks ago through Amazon with the recommended (by Amazon) SATA power splitter and extension. It came with a driver CD which included some legacy drivers for Red Hat and Suse Linux. I was very pleased to find out (Googled it) that Linux has had NATIVE (built in) support for USB 3.0 for several years. I went to the Bios setup after physical installation in case the card needed some detection and exited it with Save. Tested it with my USB 3.0 2-TB hard drive and USB 3.0 has worked fine without further configuration. It would be helpful if (1) the packaging or product description indicated native Linux compatibility and details of power requirements and (2) there was a step-by-step description for Linux installation in the user manual, including changing the alternate end plate and whether the Bios setup must be opened.
Quality of Product (5/5)
Comment Helpful? Yes - 2 No - 0 Report