You can find RAID drivers from AMD's website here. It's contain in AMD Chipset's SATA controller driver.
http://support.amd.com/en-us/download
Choose Manual select
Step 1: Chipsets
Step 2: AMD 9-series
Step 3: All 9-series
Step 4: OS version
Then you will be able to get the RAID driver from the link.
For the user manual, you can download from the link here.
