This article covers StarTech.com PCI Express拡張カード.

Overview

The StarTech.com PEXUSB3S2EI is a PCI Express 2.0 x1 expansion card that adds four external USB 3.2 Gen 1 Type-A ports to any compatible desktop PC. With a maximum data rate of 5 Gbps per port and support for UASP (USB Attached SCSI Protocol), it delivers faster file transfers compared to traditional USB BOT implementations. This card is particularly useful for systems lacking built-in USB 3.0 ports, offering a cost-effective way to connect high-speed peripherals like external SSDs, backup drives, and multi-device workstations. Note that it only supports Windows 8 and later operating systems.

Connectivity & Compatibility

The card occupies a single PCI Express x1 slot and is compatible with all standard motherboard form factors including ATX, Micro-ATX, and Mini-ITX, as long as a physical x1 or larger PCIe slot is available. It operates on PCIe 2.0 but works in PCIe 3.0 or 4.0 slots without issue due to backward compatibility. The four USB-A ports each support USB 3.2 Gen 1 (5 Gbps) and are fully backward compatible with USB 2.0 and 1.x devices. For power-hungry USB peripherals, an optional SATA power connector can supply up to 900 mA per port. The card is designed exclusively for Windows 8, 8.1, 10, and 11; it does not support macOS or Linux.

Product Info

Manufactured by StarTech.com, a trusted brand in professional IT peripherals, the PEXUSB3S2EI has been available for several years as a reliable solution for adding USB ports via PCIe. It comes with a low-profile bracket included, making it suitable for slim chassis as well. The standard warranty is two years from the manufacturer (subject to retailer terms). Priced at approximately ¥7,746 on Japan, it falls into the entry-level to mid-range category, offering excellent value for users who need to expand connectivity without replacing their motherboard.

Best Use Cases

Desktop users running out of rear USB ports: Adding four USB 3.2 Gen 1 ports is ideal for connecting peripherals such as mice, keyboards, external drives, and card readers simultaneously. Owners of legacy motherboards without USB 3.0: If your system lacks high-speed USB ports, this card provides a simple upgrade path, significantly improving transfer speeds for external SSDs. * Professionals managing multiple USB devices: With UASP support, the card ensures efficient data handling during large file transfers or when running multiple storage devices concurrently.

Product Disclosure (Amazon)

  • Manufacturer: StarTech.com(スターテック)
  • Seller: Startech Japan KK
  • Fulfilled by: Amazon
  • ASIN: B00UK3X3L0
  • Note: This article covers a manufacturer-made product based on Amazon listing details.