Only some older 3xxx cards and i think the 2900xt will work in hybrid crossfire with the IGP. The truth is though, that obtaining any of those cards would probably be a similar price to the 4670 mentioned, and would only be a dissappointing set up. The only people who should use hybrid xfire are non-gamers with a spare card lying around that happens to one of those that works. It just isn't worth it otherwise, especially if you are a gamer.