They never mentioned SATAII. Asrock might have made a S478 board that used the 915 chipset, I don't remember if that used SATAII or not. If your asking because you want to put a SATAII in your S478 board, go ahead and do it. Its backwards compatible with SATA so it will work. It might be a touch slower, but there are few drives out there right now that can get and move data faster then SATA.