I am sorry I cannot give you any help on your specific problem, but I am trying to get my Raid working on a P4G8X motherboard.
I was sold two Asus Dongles which change an ide to a serial ata drive,by the mobo supplier. They did not work.I got in touch with Asus support staff who said my board did not support the dongles. I am still trying to get another response from them, to tell me which serial ata drives are supported. So far I have not managed to get a reply. This may be similar to your setup, dongles are available, but will they work?
Hope my experiences are of some help to you.