The Retail version Radeon cards' performance is much better than the OEM cards for Macs. Why? Because Apple(or maybe ATI) has locked your card! Recently an utility called "Radeon Enabler" has come out and can help us a lot! It can patch your original "ATI Displays" program and make it unlocked, in order to modify the default settings for the card. So, let's do it! .Download&Install the original card utility "ATI Displays" released by ATI. http://www2.ati.com/drivers/macosx-radeon-displays-425.dmg .Download "Radeon Enabler 1.1.1" http://www.radeonenabler.com/download/radeon_enabler-1_1_1.dmg.sit .Double click on the icon of "Radeon Enabler" you've just downloaded, and navigate to the folder/directory where lies ATI Displays, and click "Patch". .Well Done! Open the ATI Displays icon(should be in your Applications->Utilitis folder), and ignore the error notification(you see the error notification because OEM cards don't have a tv-out onboard). Click the "3D" icon from the left panel. Click "Add" button to add a 3D game or some program file to add a specific profile. Specify your own settings on your own below. And these settings will Override the settings of the specified program. Don't "Overdrive" your card too much, or you'll know what you'll see, just like a slide show. All right, there is nothing needs me to say, just try, and open up the full power of ATI cards!! Imagine opening full effect(including the Multi & Super 6x FSAA, and 16x Anisotropic Filtering, etc) of Quake III, you'll know what "Radeon Enabler" brings.