As I understand it, RAID is AHCI with more drivers to support extra devices, so your current configuration is just fine. If you ever decide to reinstall the OS, perhaps to eliminate recalcitrant malware, install it via AHCI to minimize the number of device drivers loaded.
By the way, how much of a performance improvement did you see going from SSD-used-for-cache to OS-on-SSD?
Thanks, it seems to be quite a bit faster when iTunes loads up all my library, also IE and Outlook. Haven't done any major programs like video editing to see if that changes much. My old bood drive was an old Seagate SATA 2, so that makes up for a lot of the speed difference too I think.
I guess Samsung Magician only looks for AHCI and that's it. when checking for optimal settings., Im guessing some older RAID drivers may not have included AHCI functionality, Your answer is consistent with the help description in the BIOS menu.