The ADNET 5 Port (4 External & 1 Internal) USB 2.0 PCI Card is a legacy expansion board designed to add extra USB connectivity to older desktop motherboards via a standard PCI slot. Port Configuration: Features 4 external USB 2.0 ports on the rear bracket and 1 shared internal USB 2.0 Type-A port for internal accessories. Performance: Delivers standard USB 2.0 high-speed data transfer rates up to 480 Mbps. Backward Compatibility: Fully backward compatible with older USB 1.1 hardware at speeds up to 12 Mbps. Chipset Platform: Typically built around a reliable VIA or generic controller chipset to ensure broad system stability. Slot Requirement: This hardware uses an older, traditional 32-bit PCI connector (long slot with a distinct keyway). Motherboard Check: It will not fit into modern PCI Express (PCIe x1, x4, or x16) slots found on contemporary desktop computers. Verify your motherboard features legacy PCI slots before deployment. OS Support: Best suited for legacy or restoration setups running compatible versions of Windows or Linux.