"As of now on Crosshair IV Formula and bios 0801 primary drive is what decides which mode(IDE, RAID, AHCI) you can use. I encountered the exact same problem myself. I use SSD as well. I have had other motherboards with different types of bios but in AMI(American Megatrends Inc) bios you usually have to put primary drive on port-1 and rest as desired. If I am correct in RAID mode AHCI is activated by default so you should be able to run SSD with auto trim under Win7 without actually choosing AHCI mode. What I mean is you can have SSD running with trim and your 4x F3s in RAID at same time. I hope this answers your question"
Nem tuam hogy az AHCI aktiv ha a Raid be van kapcsolva ... bar ha atgondoljuk akkor csak igy lehet ha gond nelkul hasznalnak SSD-r Raid tomben.