https://www.techpowerup.com/240643/h...-usb-3-1-ports

HighPoint announced the RocketU 1344A, a USB 3.1 gen 2 add-on card, which puts out four type-A ports. Its USP is guaranteed 10 Gbps bandwidth for each of the four ports at all times. A PLX PCI-Express gen 3.0 bridge chip segments a PCI-Express 3.0 x4 interface into two gen 3.0 x2 connections to ASMedia-made 2-port USB 3.1 controllers. Each controller is fed with 20 Gbps of bus bandwidth, and hence the overhead on each port is minimized. This card is ideal for systems that don't support PCIe bifurcation. The company didn't reveal pricing.