I have the motherboard in question installed in a Thermaltake Core X9 case with 4 front USB 3.0. The motherboard has one USB 3.0 header and one USB 3.1 gen2 header. I've tried the gen2 to 3.0 converter cable and it results in one non-working front USB 3.0 and one that detects devices but then crashes the connection with corrupt device error messages. But the USB device works fine on the other pair of 3.0 slots connected to the 3.0 header. So I bought a PCIE USB card that had a USB 3.0 header and installed it in one of my PCIE x1 slots. But after installing it the system will not boot all the way into Windows, it gets to loading windows and then either starts over or says system is corrupted and goes to repair screen, but even with a brand new boot drive and nothing on it, it cycles through the repair over and over. Thought it was a bad PCIE card so I bought a different one, same thing happens with it. So I am wondering if anyone else has been able to get all four USB 3.0 to work short of buying a new motherboard with 2 USB 3.0 headers?
System
AMD Ryzen 7 2700X
ASUS Crosshair Hero VII Wifi
32GB 3200
MSI GTX1080
1TB M2 SSD
500GB M2 SSD
500GB SATA SSD
60GB SATA SSD
4TB 7200 SATA HD
12X Blu-ray burner
10X Blu-ray burner
Thermaltake Core X9
Acer 49in 4K monitor
System
AMD Ryzen 7 2700X
ASUS Crosshair Hero VII Wifi
32GB 3200
MSI GTX1080
1TB M2 SSD
500GB M2 SSD
500GB SATA SSD
60GB SATA SSD
4TB 7200 SATA HD
12X Blu-ray burner
10X Blu-ray burner
Thermaltake Core X9
Acer 49in 4K monitor