The mode is set for the 6 SATA ports. For windows 7 I used this link to go from IDE to Raid (without raid array), I was not able to boot the OS in AHCI mode. The dual boot might be an issue.
Anyway your speed is quite good.
For vertex 2 user, the new firmware v1.24 is working fine on this board with the modded bios from Ligushka (see my signature).
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