I have a Plextor M5P 128GB I bought recently and followed this guide to set it up, which I was told on the Plextor forum is a pretty good one that covers all the bases. I enabled the SATA storage type as AHCI before installing the OS, but my drive is showing as [IDE: SO PLEXTOR PX] in the storage boot order of the BIOS. I found another setting in the BIOS you can adjust to AHCI that I wasn't aware of, the SATA 3 controller. Setting it to AHCI after the OS install however results in the drive still showing as IDE. According to Plextor, the drive can be run as IDE or AHCI, but should run faster as AHCI. I was kinda surprised the Plextor tech didn't know whether the SATA 3 controller has to be set to AHCI before installing the OS for the drive to show as AHCI in the BIOS, but he's going to get back to me on that. Prior to getting a SATA 3 drive, in preparation I read about how to change registry settings if you want to just change the SATA storage type to AHCI in the BIOS vs re-install the OS. That worked no problem, but this is a fresh install. Does anyone know of a way to change registry settings to AHCI specifically for the SATA 3 controller? I've read a fair bit about the onboard Marvell 9128 SATA 3 controller my MB has. A lot of people don't even use it and just run SATA 2. In testing however I get much faster read speeds on it than SATA 2, about 390 vs 270. The write goes up slightly on SATA 2 from 240 to 256, but overall, SATA 3 has been much faster. I want to see if it can run even faster if I can get the drive to show as AHCI in the BIOS though.