The developer preview of OS X Mountain Lion already supports some more recent AMD and NVIDIA video cards without any tweaks, according to forum posts by so-called Hackintosh users. Several posts from the Netkas.org forums indicate that an AMD Radeon 6950 running Netkas EFI will work natively in Mountain Lion. One even claims that a 6950 will continue to work after "warm booting back to Lion from Mountain Lion."
