Check Appendix B in your motherboard manual which should have basic information on the Intel Application Accelerator you'll need to install, as well as information on setting up your RAID array in the Intel BIOS. For a detailed explanation on settings in the regular Abit BIOS, you should read
this thread over at the Abit forums. The thread is a setup guide for the IC7-G. But I think the same settings should apply to your mobo.