HIGH PERFORMANCE: 4 Port USB PCIe card with dual ASM3142 controllers with up to 20Gbps total bandwidth across 4 ports; 2x USB-A (10Gbps) 2x USB-C (10Gbps) hub; Supports USB 3.1 Gen 2/USB 3.2 Gen 2x1 TRANSFER SPEEDS UP TO 10Gbps: USB-A & USB-C PCIe card adapter supports Multiple INs maintaining max bandwidth with mixed speed devices; UASP support; ideal for use with USB devices & external storage like SSDs, HDDs, NVMe drives; Works w/ USB 3.1/3.0/2.0 OPTIONAL POWER: USB PCIe expansion card with SATA power supplies supplemental power to the USB ports (when motherboard power is insufficient) providing up to 5V 3A/15W per USB Type-C port & 5V 0.9A/4.5W per USB Type-A port COMPATIBILITY: USB C add-on card installs in full-profile PCIe 3.0 (x4 slot) desktop/server; lower performance with PCI-e 2.0; Windows/Linux/macOS auto driver install (Windows 8 & up) STARTECH.COM ADVANTAGE: IT professionals choice for over 30 years; These this USB-A & USB-C combo PCI Express Host Controller card is backed for 2-years by StarTech.com, including free 24/5 North America based multi-lingual tech support