Amazon.com: JMT PCI-E 1X to USB 3.1 Gen1 (5Gbps) 2-Port USB C+USB A Expansion Card Asmedia Chipset USB 3.1 PCI Express Card Adapter for 19pin Front USB 3.0 PCI-e Controller Pcie x1
Windows 8.1 and the ASMedia USB 3.1 XHCI 1.1 Host Controller - Plugable Knowledge Base
Fixed: ASMedia USB Host Controller was not found on Asus - Driver Easy