i dont think he is saying you need to reinstall windows. you can turn it on in the bios
btw, you have a sandforce 2281 controller, what were you trying with intel and marvell?
Its on in the bois, but I still get no speed increase past 200 mb/s. And I have tried with both intel and marvell with the same results. But I did install windows previously in ide not raid or ahci mode. Ill try reinstalling, this time to the solid state drive and see how that goes.