i had the same board. i dont think it matters i tried both, the only difference was the look of the setup i believe, i would just stick with the uefi. and on reboot you have to hit ctrl +f to get into the raid setup. i forget the exact key combo it is on the reboot its in the manual. if it doesnt work when hitting the key combo change it to legacy. but i would run raid 0 over raid 1 haha 🙂