Ive been hunting. AMD have changed their driver download pages and i cant find previous chipset drivers for w8.1. Windows 10 has its own native usb3 drivers so the chipset installer doesnt install much as it does on windows 7. IM using 8.1s own native usb3 driver on my amd system. There are some 8.1 drivers that can be found in the latest chipset packages, you'll need to look inside the w7 folders and see the read me files to see if they are for 8.1.
You will probably need smbus, usb filter(not sure about this one) and ide. I have had a look and on their main driver search by Chipset, they list the 9 series, yours i believe, and download and hunt in there. Not sure how you will get on with 8.1 raid drivers though, but they should be availible.