This article covers StarTech.com PCI Express拡張カード PCIe 3.0 x4 4ポート USB Type-C 3.2 Gen 2 各10Gbps 標準プロファイル 各種OS P10Q4C-USB-CARD.
Overview
The StarTech.com P10Q4C-USB-CARD is a PCI Express expansion card that adds four USB Type-C ports to a desktop PC or server. Each port supports data transfer speeds up to 10Gbps and is backed by its own dedicated USB controller, ensuring full bandwidth is maintained even under heavy multi-device usage. This card requires a PCIe 3.0 x4 or higher slot and includes an auxiliary SATA power connector to deliver up to 15W (5V 3A) per port. It is designed for data-only connections, making it ideal for high-speed external storage, USB networking adapters, and other bandwidth-intensive peripherals.
Connectivity & Compatibility
The interface is PCI Express 3.0 x4 or above, and the card ships with a standard-profile bracket pre-installed; a low-profile bracket is included for compact chassis. Compatible operating systems include Windows, Linux, and macOS, with plug-and-play drivers for easy setup. Each port auto-negotiates speeds of 10Gbps, 5Gbps, 480Mbps, 12Mbps, or 1.1Mbps. If the motherboard cannot supply sufficient power, the built-in SATA power connector provides an alternative power source to the USB ports.
Product Info
Released in late 2025, the P10Q4C-USB-CARD typically retails around ¥43,000 in Japan. Manufactured by StarTech.com, a brand with over 35 years of IT pro solutions, it comes with free, unlimited technical support. This card is positioned in the mid-to-high tier, targeting professional and enterprise environments rather than casual home users. It is TAA compliant, making it suitable for government and institutional procurement.
Best Use Cases
First, this card is perfect for desktop users who need to connect multiple high-speed USB Type-C devices simultaneously, such as external SSDs, video capture cards, or 10GbE USB adapters. The dedicated controllers prevent bandwidth contention. Second, system administrators managing servers that require additional USB ports will appreciate the independent power delivery and robust build. Third, developers and creative professionals using Windows, Linux, or macOS can rely on stable, high-throughput connectivity for frequent large file transfers and peripheral expansion.