ASMedia seemsto be the first company to release a USB4 host-controller. The ASM4242 is said to have a PCIe 4.0 x4 interface and support up to 64 Gbps of bandwidth. Backwards compatible with Thunderbol... ASMedia to Launch USB4 Host-Controllers This Year
nah, Intel beat them. Intel JHL8440 VIA VL830 device was second this looks like draft 4.1 spec if anything, since 40Gbit is the usb4 spec.