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2 Port PCIe SuperSpeed USB 3.0 Card - USB 3.0 Cards | StarTech.com
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4 Port PCIE PCI-e to USB 3.0 (2 x Type A+ 20 Pin Internal) Expansion Card Hub Controller PCI Express Card Adapter w/ Molex Power - Newegg.com
4-Port 5Gbps PCI-E Express to USB 3.0 Controller Expansion Card Adapter for PC 608374064088 | eBay
Adamant Computers - Custom Computers and Gaming PC. 2x USB 3.0 Port PCI-x Controller Card
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Amazon.com: StarTech.com 7 Port PCI Express USB 3.0 Card - 5Gbps - Standard & Low-Profile - SATA Power - UASP Support - 1 Internal & 6 External USB 3.0 Ports (PEXUSB3S7) : Everything Else