Internal USB 3.2 Gen 1 (3.1 Gen 1) interface card Sunix USB2321C — PCI host, 20 Gbit/s, 79.3×68.5 mm

Sunix USB2321C is an internal PCI Express interface card that adds a single SuperSpeed USB Type-C port to a desktop system. Designed for installation into a PCIe x4 (Gen3) slot, the card provides up to 20 Gbit/s aggregate data throughput using USB 3.2 Gen2x2 operation while remaining compatible with earlier USB generations. Its compact PCB (79.3 × 68.5 mm) fits standard tower or small-form-factor desktop systems and delivers reversible Type-C connectivity with built-in over-current protection and up to 5 VDC @ 1.5 A power to connected devices.

Advantages

The Sunix USB2321C enables higher data transfer speeds by supporting two 10 Gbit/s lanes for a combined 20 Gbit/s throughput, which provides significantly faster transfers compared with USB 3.2 Gen 2x1 and Gen 1x1 solutions. Because it uses a USB Type-C DFP receptacle, it offers a reversible plug for simplified connections and broad compatibility with USB 3.2, 3.1, 3.0 and legacy USB devices. The card also includes hot-swap capability and per-port over-current protection to improve system safety and convenience when connecting external storage or peripherals.

Suitable for

• High-speed external storage and NVMe enclosures requiring SuperSpeed USB Type-C links
• Transferring large media files from cameras, video capture devices and drones
• Desktop systems needing an additional modern USB-C port for peripherals and docking
• Workstations that benefit from faster backups, file transfers and media editing workflows

Key specifications

• Host interface: PCI Express (PCIe Gen3, x4 lanes)
• Output interface: USB Type-C, USB 3.2 Gen2x2 (up to 20 Gbit/s)
• Data rates supported: 20 Gbit/s, 10 Gbit/s, 5 Gbit/s, 480 Mbps, 12 Mbps, 1.5 Mbps
• Power output to device: 5 VDC @ 1.5 A with built-in over-current protection
• Form factor: internal PCB, dimensions 79.3 × 68.5 mm
• Compatibility: backward compatible with USB 3.2/3.1/3.0/2.0/1.1 devices
• Hot-plug capable: connect/disconnect without powering down the system
• Standards: xHCI host controller compliance and electromagnetic safety certifications (CE/FCC/VCCI/BSMI), RoHS compliant

How to use

Install the Sunix USB2321C into an available PCI Express x4 (or larger) slot on a powered-off desktop motherboard, secure the card bracket to the chassis, and reconnect power. After booting the operating system, install any required drivers for Windows 8.x or 10 if the OS does not automatically recognize the card. Connect USB devices using a compatible USB Type-C cable; the reversible connector simplifies insertion. The card supports hot-plugging, so devices can be connected or removed while the system is running, subject to safe removal procedures from the operating system.

Recommendations

For optimal performance, use USB 3.2 Gen2x2–capable peripherals and high-quality certified USB-C cables rated for 20 Gbit/s. Ensure the host system provides an available PCIe x4/ x8/ x16 slot and updated chipset/BIOS firmware. When connecting power-hungry devices, verify device power requirements do not exceed the card's 5 VDC @ 1.5 A output and use externally powered hubs or devices when necessary.