StarTech PEXUSB3S44V 4PT Quad Bus PCIE USB3.0 Card Adapter w UASP LP4 Power

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StarTech PEXUSB3S44V 4PT Quad Bus PCIE USB3.0 Card Adapter w UASP LP4 Power
The PEXUSB3S44V 4-Port PCI Express USB 3.0 Card lets you add four quad bus USB 3.0 ports to your PCIe x4-enabled PC. Quad bus architecture improves USB 3.0 performance by transferring data on independent 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 four host controller chipsets, each port operates on a separate independent transmission channel. Allocating up to 5 Gbps to each USB port reduces performance bottlenecks, and effectively quadruples your total available to bandwidth to 20 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 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.

Bus Type
PCI Express
Card Type
Standard Profile (LP bracket incl.)
Chipset ID
4 x Renesas/NEC - PD720202
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
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
Internal Ports
1 - SATA Power (15 pin) Plug
Maximum Cable Length
9.8 ft 3 m
Maximum Data Transfer Rate
5Gbps per port - 20Gbps Total
Type and Rate
USB 3.0 - 5 Gbit/s
UASP Support
OS Compatibility
Windows 8 (32/64), 7 (32/64), Vista (32/64), XP (32/64)
Windows Server 2012, 2008 R2, 2003 (32/64)
Linux Kernel 2.6.31 or later
System and Cable Requirements
Available PCI Express x4 or greater slot
Included in Package
1 - 4 Port PCIe USB Card
1 - Low Profile Bracket
1 - Driver CD
1 - Instruction Manual
1 lb
Item Dimension
6.57 x 5.51 x 1.10
Warranty Information
2 Year Warranty

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