along with AMD's new video cards comes an new API.............. this is probably a bigger story. ( MANTLE )
"According to AMD/EA, Mantle will be replacing DirectX 11 and since it is designed to work with the low-level hardware, it will improve pretty much all aspects of the title. From what we gather, the Mantle API is also open, so theoretically NVIDIA could use the technology in their GPUs if they wanted to do so. "