Drive size barrier on Asus Crosshair RAID/Windows 7 Pro

I havent built a RAID for some time, let alone on an AMD board, but a friend of mine wants me to use these components to build a RAID 10. Asus Crosshair Formula V and 4x 4TB Seagate Hybrid disks/Motherboard RAID. Not my choice of disk, but he has what he has. I couldn't find any limitations in the manual or around the web, so I am hoping someone can give me someone insight to build a RAID like this.
 
So the RAID 10 installed no problemo using AMDs RAID software. I am getting errors though and it dropped one of the drives. I am going to advise to replace the drives with something more appropriate like a WD RE set or set up the drives as singles. Took 16 hours to initialize and fully format.