Thats a fairly old motherboard and RAID chipset. I dont know specifically if there may be a compatibility issue with those SSD's and that chipset...but Im wondering.
If you cant figure out why it wont install, try installing to one SSD, then once Windows is up, use the driver software to migrate to RAID0. I know the current gen drivers support that.
If that doesnt work, then it.....doesnt work.