We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • TypePCI Express to USB Card
  • External USB Ports2 x USB 3.2 USB Type-A (9 pin, Gen 2, 10 Gbps)
  • Internal Ports1 x SATA Power (15 pin)
  • StandardUSB 3.2 Specification PCI Express Base Specification Rev. 3.
  • Data Transfer RateUSB 3.2 Gen 2 - 10 Gbit/s
  • Operating Systems SupportedWindows 7, 8, 8.1, 10 Windows Server 2012 R2, 2016, 2019 mac
  • 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.

Highlights

  • 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

Specifications

BrandStarTech.com
ModelPEXUSB312A3
TypePCI Express to USB Card
External USB Ports2 x USB 3.2 USB Type-A (9 pin, Gen 2, 10 Gbps)
Internal Ports1 x SATA Power (15 pin)
StandardUSB 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 RateUSB 3.2 Gen 2 - 10 Gbit/s
Operating Systems SupportedWindows 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
CompatibilityPCI 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
SpecificationsPorts: 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
FeaturesUSB 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
Dimensions0.7" x 4.7" x 4.3"
Weight2.8 oz.
Package ContentsUSB 3.1 Card
Full-Profile Bracket (Pre-Installed)
Low-Profile Bracket
Quick Start Guide
Shipping weight0.14 kg
Package size170 × 142 × 30 mm

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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.