Netkas the Genius behind Extensible Firmware Interface (EFI) get the rid of ATI Radeon 4XXX series in Hackintosh systems. With 10.5.7 ATI driver it’s finaly possible to get radeon hd 4850/4870 to work in leopard, it has some bugs yeah, but u can get it working fine. Netkas also confirmed that 10.5.7 vanila kernel works fine on core i7 Nehalem Processor with Gigabyte Motherboard. According to Netkas he Extracted 10.5.7 beta ATI drivers (jsut five kexts) and new natit, for making 4850 working in 10.5.6 Leopard. Many users confirms their 4850 on 10.5.6 with Netkas guide and Netkas suggested to wait till new 10.5.7 betas with better FB driver.