From the specs, it contains two chipsets for SATA (and RAID): The Intel Z77 native and a Marvell:
I'm assuming that one BIOS subset is for the Intel chipset (Intel OROM) and the other is a Marvell subset (Marvell OROM). You would need to see what ports go to what to determine which RAID setup to use (I would think the native Intel ports to be the fastest and most stable but that's a guess).
Chipset:
2 x SATA 6Gb/s connectors (SATA3 0/SATA3 1) supporting up to 2 SATA 6Gb/s devices
4 x SATA 3Gb/s connectors (SATA2 2~5) supporting up to 4 SATA 3Gb/s devices
1 x mSATA connector
* The SATA2 5 connector will become unavailable when the mSATA connector is installed with a solid state drive.
Support for RAID 0, RAID 1, RAID 5, and RAID 10
* When a RAID set is built across the SATA 6Gb/s and SATA 3Gb/s channels, the system performance of the RAID set may vary depending on the devices being connected.
2 x Marvell 88SE9172 chips:
3 x SATA 6Gb/s connectors (GSATA3 6/7/8) supporting up to 3 SATA 6Gb/s devices
1 x eSATA 6Gb/s connector on the back panel supporting up to 1 SATA 6Gb/s device
Support for RAID 0 and RAID 1