I have an nVidia 7600 GS. (512 MB, PCI-e, Asus, G73Board-p501h7b). But it dont works in Snow Leopard.
Snow Leopard is full working, except mine graphic card. I have tried, EFI strings, NVEnabler, Graphics Enabler, Natit, NVKush, nVinject (only resolution), nVinject ROM flashing (only 512 MB recognition). I get by all a blue screen.