What is the data transfer speed of this USB PCIe card?

The data transfer speed of this USB PCIe card is up to 10Gbps.

How many USB ports does this card add to my system?

The card adds 2 USB ports to your system.

Can I use this card with my older USB devices?

Yes, this card supports USB 3.0 and USB 2.0 devices.

will this card provide up to 10Gbps with both ports active?

Yes, this card provides up to 10Gbps per port.

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StarTech.com PEXUSB312A3 2-Port USB PCIe Card with 10Gbps/port - USB 3.1/3.2 Gen 2 Type-A PCI Express 3.0 x2 Host Controller Expansion Card - Add-On Adapter Card - Full/Low Profile - Windows & Linux (PEXUSB312A3)

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USB PCIe card has ASM3142 controller (PCIe 3.0 x2) w/2x USB-A ports
Up to 10Gbps/port
USB 3.1/3.2 Gen 2 expansion card
New version of PEXUSB312A2
USB PCI Express adapter card supports Multiple INs for max bandwidth w/mixed-speed devices
UASP optimizes performance w/ SSDs/HDDs/NVMe drives
Supports USB 3.0/2.0 devices
SATA power header provides up to 4.5W/port
Add-on card w/ full or low-profile bracket incl.
Win/Linux/macOS and auto drivers on Win 8 and up

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Best Seller Ranking	#97 in Add-On Cards

Model
Brand	StarTech.com
Model	PEXUSB312A3

Details
Type	PCI Express to USB Card
External USB Ports	2 x USB 3.2 USB Type-A (9 pin, Gen 2, 10 Gbps)
Internal Ports	1 x SATA Power (15 pin)
Standard	USB 3.2 Specification PCI Express Base Specification Rev. 3.0 Intel xHCI Specification Rev. 1.1 UASP (USB Attached SCSI Protocol) Rev. 1.0
Data Transfer Rate	USB 3.2 Gen 2 - 10 Gbit/s
Operating Systems Supported	Windows 7, 8, 8.1, 10 Windows Server 2012 R2, 2016, 2019 macOS 10.13 to 10.15, 11.0 Linux 3.5 or later LTS version only
Compatibility	PCI Express enabled computer or server with a PCI Express x4 slot or higher (x8, x16) Optional SATA power connector The maximum throughput of this card is limited by the bus interface. PCI Express Gen 1.0 max throughput is 2.5Gbps. PCI Express Gen 2.0 and Gen 3.0 max throughput is 10Gbps
Specifications	Ports: 2 Interface: PCI Express x4 Bus Type: USB 3.2 Gen 2 10Gbps Card Type: Standard Profile (LP bracket incl.) Port Style: Integrated on Card Chipset ID: ASMedia - ASM3142 Total USB Power Output: 4.5W (5V @ 0.9A) nominal, per port - Current draw above 2.0A (10W) will initiate Over-Current Protection Maximum Data Transfer Rate: 10Gbps Type and Rate: USB 3.2 Gen 2 - 10 Gbit/s UASP Support: Yes

Features
Features	USB PCIe card has ASM3142 controller (PCIe 3.0 x2) w/2x USB-A ports Up to 10Gbps/port USB 3.1/3.2 Gen 2 expansion card New version of PEXUSB312A2 USB PCI Express adapter card supports Multiple INs for max bandwidth w/mixed-speed devices UASP optimizes performance w/ SSDs/HDDs/NVMe drives Supports USB 3.0/2.0 devices SATA power header provides up to 4.5W/port Add-on card w/ full or low-profile bracket incl. Win/Linux/macOS and auto drivers on Win 8 and up

Dimensions & Weight
Dimensions	0.7" x 4.7" x 4.3"
Weight	2.8 oz.

Packaging
Package Contents	USB 3.1 Card Full-Profile Bracket (Pre-Installed) Low-Profile Bracket Quick Start Guide

Additional Information
First Listed on Newegg	January 19, 2026

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StarTech.com PEXUSB312A3 2-Port USB PCIe Card with 10Gbps/port - USB 3.1/3.2 Gen 2 Type-A PCI Express 3.0 x2 Host Controller Expansion Card - Add-On Adapter Card - Full/Low Profile - Windows & Linux (PEXUSB312A3)

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Item#: 9SIBSWCKS04449

Best Sellers

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StarTech.com PEXUSB312A3 2-Port USB PCIe Card with 10Gbps/port - USB 3.1/3.2 Gen 2 Type-A PCI Express 3.0 x2 Host Controller Expansion Card - Add-On Adapter Card - Full/Low Profile - Windows & Linux (PEXUSB312A3)

Learn more about the STARTECH PEXUSB312A3

Customer Reviews of the STARTECH PEXUSB312A3

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info