This article covers StarTech.com 5ポート増設PCI Expressインターフェースカード.

Overview

The StarTech.com PEXUSB312A1C1H is a PCI Express expansion card that adds five USB ports to your desktop computer or server. Powered by the ASMedia 3142 controller, it delivers up to 10Gbps transfer speeds via USB 3.2 Gen 2. The card provides one USB Type-C port, two USB Type-A ports on the back, and an internal 20-pin header that supports two additional USB-A ports (up to 5Gbps). This combination of USB-C and USB-A makes it an ideal solution for users who need to connect both modern and legacy peripherals simultaneously. The included SATA power connector ensures stable power delivery even on motherboards with limited USB power output.

Connectivity & Compatibility

The card uses a PCI Express 3.0 x4 interface, so any motherboard with at least a x4 slot (or larger) can accommodate it. When installed in a PCIe 2.0 slot, performance may drop due to bandwidth limitations. External port specifications: 1x USB-C port: up to 10Gbps, 5V/3A (15W) power delivery 2x USB-A ports: up to 10Gbps, 5V/0.9A (4.5W) each * Internal 20-pin IDC header: supports two front-panel USB ports (USB 3.0/3.1/2.0), up to 5Gbps Supported operating systems: Windows 8 and later (driver auto-installs), Linux, macOS. The card ships with a full-profile bracket pre-installed; a low-profile bracket is included in the box for small form factor chassis.

Product Info

The card has been available since around 2021 and continues to be sold. Pricing on Japan is around ¥10,000. The manufacturer offers a 2-year warranty and free technical support within Japan (Monday–Friday). Package contents: card, low-profile bracket, SATA power cable, quick-start guide. Market positioning is mid-range — it uses a reliable ASMedia controller and provides a solid balance of port variety and speed for everyday expansion needs.

Best Use Cases

Desktop power users who need more USB ports: If your motherboard's built-in ports are all occupied, this card adds five more without taking up additional desk space. The internal header allows you to bring ports to the front of your case. Users mixing USB-C and USB-A devices: Connect an external SSD via USB-C, a mouse via USB-A, and a printer via the other USB-A port — all at full speed. No adapters required. Server administrators: The card works reliably in server environments. The internal header can be used to add front-panel USB for maintenance or boot devices. Less ideal for: Laptop users: This is a desktop PCIe card, so it won't work in a laptop. Consider a USB hub or docking station instead. Systems with no free PCIe slot: Mini-ITX builds or pre-built PCs with limited expansion may not have room. Users who only need 5Gbps internal ports: If you don't need the 10Gbps external ports, a simpler USB 3.0 expansion card may suffice at lower cost.

Product Disclosure (Amazon)

  • Manufacturer: スターテック(StarTech.com)
  • Brand: StarTech.com(スターテック)
  • Seller: Startech Japan KK
  • Fulfilled by: Amazon
  • Model: PEXUSB312A1C1H
  • ASIN: B09BD9HJC8
  • Note: This article covers a manufacturer-made product based on Amazon listing details.