Is the installation of the software even required if I'm running in AHCI mode? I can certainly see the need if using, or wanting setup RAID, however I just don't see what value it adds or functionality it adds if using AHCI mode. It is a laptop with one hard drive and if Iinstall in RAID/IRRT mode I get performance dips when it tries to update mirror. Dell has BIOS Intel Option ROM hard coded to "data striping" and installation of software will not allow me to disable , or make it manual, the mirror update setting.
The same driver used for RAID is used for AHCI so yes its needed.