hey mate, i was able to get it working. All you have to do is update the BIOS, download the express install version and reboot when finished.
I have the exact same problem on a Gigabyte Z68MX-UD2H-B3.
I updated to the latest bios and still no dice.
Each time I build the OS, enable the SSD caching everything's great until reboot then the raid drives are not available.
I have to start from scratch and try again.
I finally gave up and setu two 64GB SSD in raid for my system drive but i'd still like to get this worked out.
Has anyone heard of this or have a solution?