I have 2 500gb hard drives I want to try out in raid but I use a 120gb ssd for my boot drive. I kinda figured out how to set up the raid but since my bios is now in raid mode not ahci it wont recognize my boot drive. So how do I get this to work.
That's strange. AHCI is a subset of RAID. So as long as your SSD is not part of the RAID array it automatically defaults to AHCI mode and should be recognized.
1.) Connect your SSD to one of the Intel 6Gb/s ports (SATA1 or SATA2) in AHCI mode.
2.) Connect your 2 HDDs to the ASMedia 6Gb/s ports (SATA7 & SATA8) in RAID mode.
3.) Reboot into the ASMedia's RAID BIOS and create a new array.