AHCI is a subset of raid.
AHCI is needed for trim support that helps the performance of a SSD.
But if your sata mode is IDE, you need to change it.
The easiest way is to simply set the sata mode to AHCI, reinstall windows, and the windows default drivers will pass the trim command properly.
With a SSD a reinstall takes little time.
If you want, there are procedures using registry hacks that will convert a running system.
Google the process to get the details.