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Green printed circuit board with two blue USB Type-A ports on a metal bracket and a small SATA power connector along the edge

STARTECH

STARTECH PEXUSB312A3 2-Port USB 3.2 Gen 2 Type-A expansion card

SKU CH-JZ9T-K8K2N MPN PEXUSB312A3

Adds two USB 3.2 Gen 2 Type-A ports at 10 Gbps each via a PCIe 3.0 x2 controller with UASP and optional SATA power

  • External USB ports2 x USB 3.2 USB Type-A (9 pin, Gen 2, 10 Gbit/s)
  • Internal ports1 x SATA Power (15 pin)
  • Supported standardsUSB 3.2 Specification PCI Express Base Specification Rev. 3.
  • Transfer speedUSB 3.2 Gen 2–10 Gbit/s
  • Supported operating systemsWindows 7, 8, 8.1, 10 Windows Server 2012 R2, 2016, 2019 mac
  • Product typePCI Express to USB Card
  • Up to 10 Gbps per port with USB 3.2 Gen 2 speed
  • ASM3142 controller on PCIe 3.0 x2 delivers full bandwidth per port
  • UASP support accelerates SSD and HDD transfers
  • Optional SATA power header supplies up to 4.5 W per port
  • Full-profile and low-profile brackets included for any case size

Two USB 3.2 Gen 2 Type-A ports at 10 Gbps

This PCIe 3.0 x2 expansion card adds two USB 3.2 Gen 2 Type-A connectors to a desktop or server. The ASMedia ASM3142 controller delivers up to 10 Gbps per port and supports UASP for faster storage transfers. It fits systems with an x4, x8 or x16 slot and includes both full-height and low-profile brackets for standard or slim chassis.

10 Gbps per port limited by PCIe generation

Each port can reach 10 Gbps when the host slot runs at PCIe 3.0 or 2.0 speeds; a Gen 1.0 slot caps throughput at 2.5 Gbps. The card draws up to 4.5 W total (5 V at 0.9 A) from the optional SATA power header, so bus-powered drives and high-current peripherals work without a separate adapter. Backward compatibility covers USB 3.0 and 2.0 devices.

ASM3142 controller with SATA power and dual brackets

The ASM3142 chipset handles multiple IN transactions to maintain bandwidth with mixed-speed devices connected simultaneously. A 15-pin SATA power connector on the card supplements slot power for consistent port output. Both standard and low-profile brackets are supplied, letting the card fit full-height or slim enclosures without extra parts.

How it compares

Measured against everything we stock in PCIe Expansion Cards, at today’s prices. Recalculated every night.

Price $38.99
Pricier than about 62% of the 891 comparable items (median $30.99).

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Specifications

Product
Brand nameStarTech.com
Model namePEXUSB312A3
Product typePCI Express to USB Card
Performance
Transfer speedUSB 3.2 Gen 2–10 Gbit/s
Connectivity
Supported standardsUSB 3.2 Specification
PCI Express Base Specification Rev. 3.0
Intel xHCI Specification Rev. 1.1
UASP (USB Attached SCSI Protocol) Rev. 1.0
Ports & slots
External USB ports2 x USB 3.2 USB Type-A (9 pin, Gen 2, 10 Gbit/s)
Internal ports1 x SATA Power (15 pin)
Size & build
Product dimensions0.7 in × 4.7 in × 4.3 in
Product weight2.8 oz
Shipping weight0.14 kg
Package size170 × 142 × 30 mm
Compatibility
Supported operating systemsWindows 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
In the box
In the boxUSB 3.1 Card
Full-Profile Bracket (Pre-Installed)
Low-Profile Bracket
Quick Start Guide

Questions about this item

Will the PEXUSB312A3 run at full 10Gbps per port on my PCIe 2.0 x4 slot?

Yes — PCIe 2.0 and 3.0 both deliver the 10Gbps maximum; only a Gen 1.0 slot would limit throughput to 2.5Gbps.

How can I verify the ASM3142 controller is active after installing the card?

Check Device Manager or lspci for an ASMedia ASM3142 USB controller and confirm each port negotiates 10Gbps SuperSpeed+ with a Gen 2 device.

Does the box include both mounting brackets and is the SATA power cable supplied?

The package contains the card with a full-profile bracket already fitted, a low-profile bracket, and a quick-start guide; a SATA power cable is not included.

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