1) Connect the HDDs to the SATAII on the ICH10R.
2) Enable RAID in the BIOS.
3) Save and restart.
4) When booting press "Ctrl+I" when prompted to enter the RAID setup.
5) Follow the on-screen instructions. (Select HDDs for the array, select RAID type, stripe size, etc.)
6) Done.
Note: If you installed the OS with IDE/AHCI enabled, then you may have to reinstall the OS.