Dual Boot just means it ask you what OS to boot into: Windows, or Linux. In my case I'd be booting into Linux.
ATi does have drivers, but in a chat room I asked they said most cards weren't supported. Although I doubt it because it's a driver for all cards Radeon 8500 and up. Kind of like CATALYST drivers, Radeon 8500 and up.
So if someone may know of a driver for ATi cards on Linux then PLEASE post them.