AMD´s Dresden, New York fabs could make GPUs
 

ORDINARILY, YOU have to design a GPU for the specific Fab in which you intend to build it. Therefore you have the chips such as ATI's RV515 which is the TSMC chip and RV516, which is the UMC version. It is interesting that both chips have the same specification but the Fabs are not compatible and neither is able to make a chip designed for the competition's fab.