i believe the AHCI does help because my new system seem boot slower than my last time system (Amd X2 3800+, Asus M2N-E board, 2GD Hyper-X , 150GB raptor) compared with Current Newly Build system(Q6600, P5K EPU with same ram and harddrive) changing to P5K Pro to confirm 1st with AHCI enable..