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A PCI Express USB 3.0 4-port expansion card allows you to add additional USB 3.0 ports to your computer system by installing it into a PCI Express slot on your motherboard. Here are some typical details you might expect for such a card: 1. Interface: PCI Express (PCIe) interface, which provides high-speed data transfer between the expansion card and the motherboard. 2. USB Ports: Four USB 3.0 ports for connecting various USB devices, such as external hard drives, flash drives, printers, and more. USB 3.0 ports offer faster data transfer speeds compared to USB 2.0, making them suitable for high-bandwidth devices. 3. Compatibility: Compatible with standard PCI Express slots on desktop computers. Ensure that your motherboard has an available PCIe slot and is compatible with the expansion card. 4. Data Transfer Speed: USB 3.0 ports support data transfer speeds of up to 5 Gbps (gigabits per second), allowing for quick file transfers and efficient data access. 5. Backward Compatibility: