i am going to run an installation on a solo drive since i do have the time and want to test it to see how good AHCI is...although, AHCI is like NCQ and that only comes to fruition when you have multiple file requests going on at the same time...AHCI driver can work out of order for the requests by picking out the closest request first...it supposedly avoids thrashing from disc to disc looking for the files which leads to greater time getting the job done.