I got PROM21 AIC from WisdPi, which contain AMD X870 chipset. Here is cpu-z of my Frankenstein system for AMD X870 chipset + EPYC Rome CPU + Supermicro H12SSL-NT. Finally, I can expand USB port not only 6ports of 5Gbps but also 4 ports of 10G and one 20G!! #PROM21#WisdPi