3 Port PCI Express 12V PoweredUSB Adapter Card - USB PlusPower

Add three 12 volt PoweredUSB ports to any PC with a PCI Express slot

Product ID: PEX312PUSB

0 stars (0 reviews) |
  • 3 external 12V Powered USB Connectors
  • Fully Compliant with PCI Express Base Specifications, Revision 1.0a
  • Powered from either the 1x PCI Express slot or the Power Supply of the P.C. with a standard LP4 connection

The PEX312PUSB 3 Port PCI Express 12V PoweredUSB Adapter Card allows you to add three Powered USB (USB PlusPower) ports to any standard form-factor computer, using an available PCI Express Slot.

Drawing power from either the PCI Express slot or the computer power supply, the powered USB adapter card provides up to 3A of current to each connected device, allowing for up to three Powered USB devices to be installed at the same time.

Plus, the PCI Express Powered USB Adapter card can be connected to the corresponding accessory daughter board PUSBADAP (2 Port Low Profile 12V/24V Powered USB Adapter Card), to create two additional Powered USB ports, but does not require a second PCI Express slot.

Backed by a StarTech.com lifetime warranty and free lifetime technical support.


  • Ideal for adding portable scanners, receipt printers, and digital scales to new Retail Point-of-Sale (POS), or Point-of-Care (POC) PCs
  • Install into integrated Kiosks to provide power to Parking Garage/Gas Station receipt printers
  • Provide power and data connection to remote surveillance cameras
  • Upgrade Mobile Computing systems such as delivery services/overland transportation vehicles
  • Gaming industry (joysticks with feedback mechanisms)
  • External CD-ROM, DVD drive and Hard drives that require more than 500mA current

The StarTech.com Advantage

  • Connector locking mechanism provides a secure connection, preventing cables from being unplugged accidentally
  • Backwards compatible with standard USB 2.0, USB 1.1 and Powered USB peripheral devices for added versatility
  • Enables a low-cost, standard PC to become a powerful retail system

Partner Numbers

  • UPC 065030831543


  • Windows 8 logo
  • Windows 7 logo
Windows® 8 (32/64bit), 7 (32/64), Vista(32/64), XP(32/64), 2000, ME


Warranty Information Warranty Lifetime
Connector(s) 1 - Connector Type(s) PCI Express x1
1 - Internal Ports LP4 (4 pin; Large Drive Power)
IDC (10 pin, Motherboard Header)
3 - External Ports PoweredUSB 12V (8 pin, Host Side)
Hardware Ports 3
Bus Type PCI Express
Card Type Standard Profile
Chipset ID Renesas/NEC - D720101GJ
Packaging Information Package Length 22.7 cm [8.9 in]
Package Width 43 mm [1.7 in]
Package Height 16.3 cm [6.4 in]
Shipping (Package) Weight 0.2 kg [0.5 lb]
Performance Maximum Data Transfer Rate 480Mbps
Physical Characteristics Product Length 12.1 cm [4.7 in]
Product Width 69.2 mm [2.7 in]
Weight of Product 200 g [7.1 oz]
Software OS Compatibility Windows® 8 (32/64bit), 7 (32/64), Vista(32/64), XP(32/64), 2000, ME
Special Notes / Requirements Note Approximately 100W of spare power is required from the power supply when peripheral devices are connected and running
What's in the Box 1 - Included in Package Powered USB Card
Instruction Manual



SATA to LP4 Power Cable Adapter

Power an IDE hard drive from a SATA Power connection.

Your price
€3.99 EUR excl. VAT
€4.91 EUR incl. VAT

In stock: 1194

Where to buy StarTech.com products


Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)


Product Support

Talk to an Advisor

We are always ready to assist you with any questions you may have.

Live Chat (opens in new window)

Frequently Asked Questions


When you troubleshoot issues with a USB controller card, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:

  • USB cables

  • USB devices

  • USB controller card

To test your setup components, try the following:

  • Use the USB cable, device, and controller card in another setup to see if the problem is with the components or the setup.

  • Use a different USB cable, device, and controller card in your setup to see if the problem persists. Ideally, you should test a component that you know works in another setup.

When you test your cables, it is recommended that you do the following:

  • Test each cable individually.

  • Use short cables when you are testing.

When you test the USB device and controller card, it is recommended that you do the following:

How To

To confirm that Windows detects your expansion card, complete the following:

  1. Press the Windows key+R, type devmgmt.msc, and press Enter.
  2. In Device Manager, under the appropriate heading, confirm that your expansion card is listed and that there isn't an exclamation mark next to it.  For example, a USB controller card would be under Universal Serial Bus controllers.

Your expansion card is listed according to the name of the chipset. To determine the name of the chipset of your expansion card, navigate to www.StarTech.com and look on the Technical Specifications tab for your product.

Before You Buy

The USB expansion cards derive power from the PCI or PCI Express slot on the motherboard. When high-powered USB devices are connected to the USB expansion card, the power provided by the slot may not be enough to power all of the devices and you should connect additional sources of power. When you troubleshoot issues, you should connect an additional source of power.

Symptoms that you are experiencing power-related issues include certain devices not working correctly, not all of the devices working at the same time, and certain devices not working at all.

Examples of low-powered USB devices include USB mice, keyboards, and flash drives. An example of a high-powered USB device is an external hard drive that does not have an external source of power.

Compliance and safety

Compliance letters

Safety Measures

  • If product has an exposed circuit board, do not touch the product under power.
  • If Class 1 Laser Product. Laser radiation is present when the system is open.
  • Wiring terminations should not be made with the product and/or electric lines under power.
  • Product installation and/or mounting should be completed by a certified professional as per the local safety and building code guidelines.
  • Cables (including power and charging cables) should be placed and routed to avoid creating electric, tripping or safety hazards.
*Product appearance and specifications are subject to change without notice.

Customer Reviews

(0 reviews)
0 out of 5 stars
  • 5 (0)
  • 4 (0)
  • 3 (0)
  • 2 (0)
  • 1 (0)
Tell us what you think of this product.
Need a little help getting started?

Check out our review guidelines.

Back to top