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Quick-Start Guide

To view manuals, FAQs, videos, drivers, downloads, technical drawings, and more, visit www.startech.com/support.

Manual Revision: May 14, 2020 1:26 PM

Product Diagram (PEXUSB312A3)

Component

Function

1

USB-A Ports

• 

Used to connect a 

USB Peripheral Device 

to 

the

 USB Card

.

2

Bracket Screws

• 

Used to 

Secure 

the

 Low Profile 

or

 Full Profile 

Bracket 

to the

 USB Card.

3

PCI Express Connector

• 

Used to connect the 

USB Card

 to the 

PCI 

Express Slot

 on the 

Host Computer

.

4

SATA Power Connector

• 

(Optional) Connect a 

15 Pin SATA Power 

Connector

 to provide extra power to the 

USB 

Type-A Ports.

Requirements

For the latest requirements, please visit 

www.startech.com/PEXUSB312A3

• 

Computer with an available PCI Express® slot (x4, x8, or x16)

• 

(Optional) SATA Power Source

Tools

• 

Small Phillips® Head Screwdriver

2-Port USB 3.1 Card | 10Gbps per port | 2x USB-A | PCIe

Hardware Installation

Installing the Low Profile Bracket

By default the 

Full Profile Bracket

 is attached to the 

USB Card

. Depending on your 

system configuration you may need to remove the 

Full Profile Bracket

 and replace it 

with the 

Low Profile Bracket

 (included).

1. 

Using a 

Small Phillips Head Screwdriver 

(sold separately), remove the two 

Bracket 

Screws

 securing the 

Full Profile Bracket

 to the 

USB Card

.

2. 

Align the 

Screw Holes

 on the 

USB Card

 with the 

Screw Holes

 on the 

Low Profile 

Bracket

. Making sure the 

USB Card

 is sitting on top of the 

Screw Holes

 on the 

Low 

Profile Bracket

.

3. 

Insert the 

Bracket Screws

 through the 

USB Card

 and into the 

Screw Holes

 on the 

Low Profile Bracket

.

4. 

Using the 

Small Phillips Head Screwdriver

, tighten the 

Bracket Screws,

 being 

careful not to over-tighten.

Installing the USB Card

Warning: 

USB cards can be damaged by static electricity. Make sure that you are 

properly grounded before you open the computer case or touch the 

USB Card

. You 

should wear an anti-static strap when you install any computer components. If an 

anti-static strap is not available, discharge any built-up static electricity by touching 

a large grounded metal surface for several seconds. Only handle the 

USB Card

 by its 

edges and do not touch the gold connectors.

1. 

Turn off the 

Host

 

Computer

 and disconnect any 

Peripheral Devices

 that are 

connected (e.g. printer, external hard drives, etc.).

2. 

Unplug the 

Power Cable

 from the back of the 

Host Computer

.

3. 

Remove the 

Cover

 from the 

Host Computer’s Case

Note: 

Consult the documentation that came with the 

Host Computer

 for details 

about how to remove the 

Cover

 safely.

4. 

Locate an open

 PCI Express Slot

 (x4, x8, or x16) and remove the corresponding 

Metal Cover Plate

 from the back of the 

Host Computer’s Case

5. 

Gently insert the 

USB Card

 into the open 

PCI Express Slot

 and fasten the 

Bracket

 

to the back of the 

Host Computer’s Case

.

6. 

(Optional) Connect a 

15 Pin SATA Power Connector

 from the 

Power Supply

 to the 

SATA Power Connector

 on the 

USB Card

.

2

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