I put my old asus geforce 7300 le 128 mb card and it solved the problem,... but the performance is naturally not the same..

is it issue of xfx 8500gt 512 card?
what can i do to solve it?
8500gt 512 is still better than 7300 le 128.

I have no injectors (nvinject. natit nvkush etc are deleted) - use efi string method through osx86tools