ICH9, ICH8, ICH7 and ICH6-based chipsets, as well as ICH5 and ICH5R-based chipsets, do not use AHCI.
Moral of the story? If you want full AHCI support for your SATA devices on an Intel southbridge, get one that uses the RAID version of the southbridge even if you aren't going to use the RAID functions. If you're wondering what AHCI gives you...without it you won't have support for NCQ or Hot Plug features. There are other features, but those are the two most used features.
Edited by nmX.Memnoch, 21 September 2007 - 06:44 PM.