Yes, you will probably need RAID drivers to run the install. Go to the Asus Support site and check for your motherboard model. Find the RAID drivers and download them (they might be in their own RAID section, but if you don't see one, check the SATA section instead). Extract the drivers to a flash drive (you can extract them to your install media if you are installing Windows 8 from a flash drive as well) and boot up the machine to begin the install. When you get to the screen where you select the drive you want to install to, you will have an option to load load additional drivers.
Point the installer to the extracted RAID drivers and it will load them. Once complete, you should see your RAID array in the drive list and can then select it to begin the install.