I'm not familiar with the motherboard, but I honestly wouldn't suggest it, as long you're sticking to one disk per channel.
While I've just said that you can do it, I don't suggest creating dynamic disk sets over RAID 0s. You're just uping your chance of disaster by a whole lot. -- not to mention the complication and extra CPU cycles that'll go into this.
I'd suggest either putting everything together in JBOD, or just RAID 0ing a pair and letting the other two hang.