This article covers 玄人志向 USB3.2 Gen2 (10Gbps) Type-C×2 インターフェース カード (PCI-Express x4 接続) ASMedia社製 ASM3142 搭載 USB3.2C-P2-PCIE3.

Overview

The Kuroutoshikou USB3.2C-P2-PCIE3 is a PCI Express x4 interface card that adds two USB 3.2 Gen2 (10Gbps) Type-C ports to any desktop PC. It uses the widely trusted ASMedia ASM3142 controller, ensuring stable data transfers and broad OS compatibility. A low-profile bracket is included, making it suitable for slim tower cases as well. This card is an excellent solution for users who need more high-speed USB-C ports on their desktop. Whether you're connecting external SSDs, USB-C hubs, or other peripherals, the 10Gbps bandwidth significantly outperforms older USB 3.0 (5Gbps) ports. Power is supplied via a SATA power connector, delivering up to 5V/3A per port (4A total), though USB Power Delivery is not supported.

Connectivity & Compatibility

Interface: PCI Express 3.0 x2 (internal x2, card edge x4) Controller: ASMedia ASM3142 Ports: 2x USB 3.2 Gen2 Type-C (10Gbps each) Power: SATA power connector (max 5V/3A per port, 4A total) OS Support: Windows 10 / 8.1 (native driver), Windows 7 (included driver) Form Factor: Standard bracket + low-profile bracket included Note that PCIe 3.0 x2 provides roughly 16Gbps of bidirectional bandwidth. If both ports are saturated simultaneously, there may be theoretical bandwidth limitations, but in typical real-world use (e.g., one external SSD and one hub), performance remains excellent. The card requires a PCIe x4 or larger slot; it will not fit in x1 slots.

Product Info

Released around 2020, the USB3.2C-P2-PCIE3 remains widely available. Pricing is around ¥4,414 on , making it one of the most affordable USB 3.2 Gen2 interface cards on the market. The manufacturer offers a 1-year warranty. Included accessories: standard bracket, low-profile bracket, and a driver disc for Windows 7. Market positioning is entry to mid-range. The ASM3142 controller is a proven workhorse, and this card delivers reliable 10Gbps performance at a budget-friendly price. However, it lacks USB PD and does not support the newer 20Gbps (USB 3.2 Gen2×2) standard.

Best Use Cases

Desktop users needing USB-C ports: Ideal for motherboards without USB-C or with limited rear I/O. Perfect for connecting high-speed external SSDs, USB-C monitors, or docking stations. Slim tower builders: The included low-profile bracket allows installation in compact cases, provided a PCIe x4 or larger slot is available. * Budget-conscious DIYers: This card offers excellent value for adding 10Gbps USB-C connectivity without breaking the bank. The ASM3142 controller is known for stability and broad compatibility. Not recommended for users who require USB Power Delivery for charging laptops or need 20Gbps speeds. Also unsuitable for systems without a free PCIe x4 (or wider) slot.

Product Disclosure (Amazon)

  • Manufacturer: 玄人志向
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B085GTD5CH
  • Note: This article covers a manufacturer-made product based on Amazon listing details.