I’m paranoid about RAID for reasons like this… It may not be as good, but I just rsync what I need backed up… Not that that helps any right now. Good luck on the motherboard hunt, and yotsuya’s suggestion of contacting Gigabyte might actually be a good idea at this point.
The RAID is for speed, working with files that require 2.88GB/s transfer rate to maintain realtime playback is the main issue. In this case it isn’t about redundancy, just about transferring data at decent rates so you aren’t waiting on the I/O constantly.