2 Port PCI Express (PCIe) SuperSpeed USB 3.0
Card Adapter with UASP - LP4 Power
Product ID: PEXUSB3S25
The PEXUSB3S25 2-Port PCI Express USB 3.0 Card lets you add two USB 3.0 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 3.0 bus-powered devices (500mA for USB 2.0).
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 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 3.0 adapter is compliant with USB 3.0 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.
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Backed by a StarTech.com 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, StarTech.com add-on USB 3.0
cards, a UASP-enabled StarTech.com enclosure,
and a SATA III solid state drive.
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Certifications, Reports
and Compatibility
Applications
• Upgrade an older PCIe-based system from USB 2.0 to USB 3.0
connectivity
• Expand the USB capabilities of your system with two additional
external ports
• Connect additional external hard drives, CD/DVD drives, MP3 players,
printers, scanners, webcams, game controllers, digital cameras, etc.
to a computer system
Features
• Provides two external USB 3.0 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 3.0 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
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Warranty 2 Years
Hardware Bus Type PCI Express
Card Type Standard Profile (LP bracket incl.)
Chipset ID Renesas / NEC - µPD720202
Industry Standards USB 3.0 Specification Rev. 1.0
USB Battery Charging Specification Rev. 1.2
PCI Express Base Specification Rev. 2.0
Intel xHCI Specification Rev. 1.0
Interface USB 3.0
Port Style Integrated on Card
Ports 2
Performance Maximum Cable Length 9.8 ft [3 m]
Maximum Data Transfer Rate 5 Gbps
Type and Rate USB 3.0 - 5 Gbit/s
UASP Support Yes
Connector(s) Connector Type(s) 1 - PCI Express x1 Male
External Ports 2 - USB Type-A (9 pin) USB 3.0 Female
Internal Ports 1 - LP4 (4 pin, Molex Large Drive Power) Male
Software OS Compatibility Windows® Vista, 7, 8, 8.1, 10
Windows Server® 2008 R2, 2012, 2012 R2, 2016
Linux 2.6.31 to 4.4.x LTS versions only
Special Notes /
Requirements
Note Devices that do not comply with the USB Battery Charging
Specification may only receive standard USB power.
System and Cable Requirements Available PCI Express slot
Environmental Humidity 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)
Physical
Characteristics
Product Height 4.7 in [120 mm]
Product Length 3.2 in [82 mm]
Product Weight 1.8 oz [51 g]
Product Width 0.7 in [18 mm]
Packaging
Information
Shipping (Package) Weight 5.4 oz [153 g]
What's in the Box Included in Package 1 - PCIe USB 3.0 Card
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1 800 265 1844
1 - Low Profile Bracket
1 - SATA to LP4 Cable
1 - Driver CD
1 - Instruction Manual
Product appearance and specifications are subject to change without notice.
www.startech.com
1 800 265 1844
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