This article covers StarTech.com 4ポートUSB 3.1(10Gbps) 増設PCIeカード 4x USB-A搭載PCIeインターフェースカード 2 x 10Gbps専用チャネル PEXUSB314A2V.

Overview

The StarTech.com PEXUSB314A2V is a PCIe x4 add-on card that brings four USB 3.1 Gen 2 (10Gbps) ports to any desktop PC. Its standout feature is a dual-channel architecture: two independent host controller chipsets each manage two ports, providing a dedicated 10Gbps channel per pair. This yields a combined throughput of up to 20Gbps, eliminating the bandwidth sharing bottleneck common in single-bus USB cards. This design makes the card ideal for users who need to connect multiple high-speed peripherals simultaneously, such as external SSDs, fast storage enclosures, or video capture devices. The four USB Type-A ports on the rear bracket are backward-compatible with USB 2.0 and USB 3.0 devices, ensuring broad device support.

Connectivity & Compatibility

The card uses a PCI Express x4 interface (Rev. 3.0 compliant) and can be installed in x16 or x8 slots as well. Two separate controller chips manage the four ports in a dual-channel configuration, each handling two ports with its own 10Gbps bus. Supported devices include USB 3.1 Gen 2 external HDDs/SSDs, USB hubs, docking stations, audio interfaces, and more. UASP (USB Attached SCSI Protocol) Rev.1 support improves data transfer efficiency over traditional BOT (Bulk-Only Transport), especially for sequential reads and writes. For power delivery, an optional SATA power or peripheral power connector can be attached to the system PSU, supplying up to 900mA per port under USB 3.1 operation. This ensures stable power for bus-powered external drives that might otherwise struggle with standard USB port current limits.

Product Info

Released around 2017, the PEXUSB314A2V sits in the mid-to-high-end segment of the USB expansion card market. Pricing is approximately ¥15,800 on (as of June 2026), offering good value for a four-port, dual-channel solution. The card comes with a standard 2-year warranty from StarTech.com. A low-profile bracket is included in the box, making it compatible with slim or small-form-factor PC cases. Availability is good through Japan and select PC specialty retailers.

Best Use Cases

First, this card is a strong fit for creative professionals and data analysts who run multiple external SSDs or high-speed storage arrays. Video editors and large-file transfer workflows benefit directly from the dual-channel bandwidth, avoiding slowdowns when copying to several drives at once. Second, desktop users who have run out of motherboard USB ports will appreciate the expansion. Gamers and streamers connecting VR headsets, capture cards, and multiple USB 3.1 peripherals simultaneously will find both the port count and the dedicated bandwidth essential. Finally, owners of older PCs (Intel 6th/7th Gen or AMD Ryzen 1000 series and earlier) can add USB 3.1 Gen 2 speeds without upgrading the entire platform. As long as a free PCIe slot is available, this card unlocks full-speed access to modern high-speed USB devices.

Product Disclosure (Amazon)

  • Manufacturer: StarTech.com(スターテック)
  • Seller: イーストスクエア
  • Fulfilled by: Amazon
  • ASIN: B071DFQ6TW
  • Note: This article covers a manufacturer-made product based on Amazon listing details.