My board has an ICH10R chipset, and the manufacturer (Gigabyte) has a download for RAID software (that doesn't work), but there's no RAID option anywhere in the BIOS, and the word around the web is that the board (GA-EP43-UD3L) doesn't support RAID.
Correction, the Gigabyte GA-EP43-UD3L does not have the ICH10R chipset (R designating that the chipset supports RAID) it has the ICH10 (no R designation) southbridge; it's plainly stated on the Gigabyte website for that motherboard.
That is the reason you can not configure RAID on the motherboard. RTFM!
The only way you can get RAID is using a separate controller card.