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Green circuit board with gold PCIe edge connector and two USB-C ports on a metal bracket

STARTECH

STARTECH PEXUSB312C3 2-Port PCIe USB 3.1 Gen 2 expansion card

SKU CH-5BC5-MSBFP MPN PEXUSB312C3

Adds two USB-C ports with 10 Gbps throughput via a PCIe x4 slot, includes SATA power for high-draw devices and a low-profile bracket

  • External USB ports2 x USB Type-C (24 pin) USB 3.1 (10 Gbit/s) Female
  • Internal ports1 x SATA Power (15 pin) Plug
  • Supported standardsUSB 3.1 Gen 2
  • Transfer speedup to 10 Gbit/s
  • Supported operating systemsWindows 7, 8, 8.1, 10 Windows Server 2008 R2, 2012, 2016, 20
  • Product typePCI Express to USB Card
  • Add two high-speed USB-C ports with up to 10 Gbit/s throughput
  • Optional 15-pin SATA power connector supports high-power USB devices
  • Dual-profile bracket fits both standard and low-profile chassis
  • ASMedia ASM3142 chipset delivers USB 3.1 Gen 2 performance
  • Broad OS support across Windows, Linux and macOS versions

Two-Port USB-C Card

This PCI Express add-on card adds two USB Type-C ports that operate at the USB 3.1 Gen 2 standard with up to 10 Gbit/s throughput. It targets desktop or server builders who need modern USB-C connectivity on a platform that lacks native ports. The card installs in any PCI Express x4, x8 or x16 slot and includes a low-profile bracket for compact chassis.

Sustained Throughput

The ASMedia ASM3142 controller supports UASP and the USB 3.2 Rev 2.0 specification to maintain high transfer rates during extended file operations. An optional 15-pin SATA power connector supplies extra current for demanding peripherals so performance does not throttle under continuous load. Driver support spans Windows 7 through 10, Windows Server 2008 R2 through 2019, Linux 3.5 to 4.11.x LTS and macOS 10.13 to 10.15.

Dual-Profile Build

A standard-profile bracket comes fitted and a low-profile bracket is included, letting the same card fit full-height or slim enclosures without modification. The x4 edge connector seats securely in longer PCIe slots while the two integrated USB-C receptacles face the rear panel for clean cable routing. No internal USB headers are used; all connectivity is external.

How it compares

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

Price $51.99
Pricier than about 71% of the 891 comparable items (median $30.99).

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Specifications

Product
Brand nameStarTech.com
Model namePEXUSB312C3
Product typePCI Express to USB Card
Performance
Transfer speedup to 10 Gbit/s
Connectivity
Supported standardsUSB 3.1 Gen 2
Ports & slots
External USB ports2 x USB Type-C (24 pin) USB 3.1 (10 Gbit/s) Female
Internal ports1 x SATA Power (15 pin) Plug
Size & build
Product dimensions0.7 in × 4.8 in × 3.1 in
Product weight0.1 lb (0.05 kg)
Shipping weight0.14 kg
Package size152 × 127 × 51 mm
Compatibility
Supported operating systemsWindows 7, 8, 8.1, 10
Windows Server 2008 R2, 2012, 2016, 2019
Linux 3.5 to 4.11.x LTS version only
macOS Catalina (10.15)
macOS Mojave (10.14)
macOS High Sierra (10.13)
Compatible withPCI Express enabled computer or server with a PCI Express x4 slot or higher (x8, x16)
In the box
In the box1 x USB 3.1 Card
1 x Low Profile Bracket
1 x Quick Start Guide

Questions about this item

How much heat or noise does the ASM3142 chipset produce when the card runs at 10Gbps all day?

The ASM3142 controller is a passive component with no fan, so it adds no audible noise; heat output is minimal and handled by the case airflow.

Does my power supply need a free 15-pin SATA connector for this card to work?

The optional 15-pin SATA power plug is only required when you attach high-power USB-C devices; the card draws slot power for the controller itself.

Will the x4 PCIe 3.0 link saturate if I keep an older PCIe 2.0 x8 slot?

The card requires a PCIe x4 slot or higher; in a 2.0 x8 slot the link negotiates to PCIe 2.0 x4, halving the maximum bandwidth to 5Gbps.

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