ACHI is found on Intel motherboards. Haven't seen it on any amd boards. I've tried ide and achi, and saw no difference in speed using hdtune, a free download. I also use ie privacy keeper 2.7, another free download that cleans up files everytime you exit explorer or power down, depending on which option you choose. Check your ssd website for any bios updates. I've updated my ssd bios twice, the last time for trim support which is for windows 7. Update the ssd bios before you load windows if needed.