StarTech.com PEXUSB3S2E2I 4 Port USB 3.0 PCI Express PCIe Controller Card - 2 Ext 2 Int with SATA Power Supports SuperSpeed USB 3.0 connectivity with data transfer rates up to 5 Gbps and 80% more device power delivery than USB 2.0 The card features both internal and external USB 3.0 ports - a versatile solution for adding common USB 3.0 devices (e.g. hard drive enclosures, etc.), as well as devices that require an internal system connection (front panel USB 3.0 hubs or card readers) PCIe USB 3.0 controller uses a SATA power connector to draw power for compatible devices, as opposed to an LP4 power connector, making it more suitable for newer systems with power supplies that don't offer enough LP4 connectors. 4x USB 3.0 ports: 2x External USB 3.0 ports + 2x Internal (motherboard header) USB 3.0 ports Fully compliant with USB 3.0 revision 1.0 specifications and Intel xHCI rev0.95 specifications, with support for data transfer rates up to 5 Gbps Built-on SATA power connector, which supports power delivery to USB 3.0 devices (up to 900mA per port) Backward compatible with USB 2.0 and USB 1.0/1.1 devices Compliant with PCI Express 2.0 specifications