EVGA nVidia GT520 2GB PCI E Works with Clean Install or Update, with "GraphicsEnabler=yes" and replace the NVidia Kexts by Kilumnati provide HERE
Asus Nvidia GT520 Kext for Mountain Lion 10.8.zip - Downloads - OSx86.net Just install with Kext Utility and Repair Permissions, Reboot and Done! You have full graphics on your Hackintosh and, if you want, two monitors through HDMI - DVI connectors. Thanks to all for your helps. Sorry about my English.
My Hackintosh:
Gateway Desktop GT4222m, MOBO Intel G33 ICH9, 8 GB RAM DDR2 (4x2), 1 HD 500 GB WD SATA for Mountain Lion system and apps, and 3 HDs 1TB WD SATA (e/o) for personal informations and files, DVD Burner Liteon SATA, Integrated Sound, EVGA nVidia GT520 2GB, USB Bluetooth adapter, Apple Keyboard, Apple Magic Mouse and Apple Trackpad. Monitor HP 24" HD HDMI and Gateway 23" HD Display DVI.