My Gigabyte MB has 2 RAID options. The GigaRAID with 2 drives in either 0 or 1 and the Intel Matrix RAID on the ICH 10R Southbridge.
I run XP on my GigaRAID in RAID 0 and I run Windows 7 on my Matrix controller with the 2 drives in a RAID 0+1 configuration.
The Matrix option allows for more than one RAID array to be run ........RAID 0 , RAID 1 , Raid 0+1 ,RAID 5 or even RAID 10 and pretty much any combination of those you would want.