To test your system: Open your "System Preferences" panel Choose "Appearance" On the bottom of this panel where it says, "Font smoothing style" choose "Light" Now close out "System Preferences" and also close TextEdit, if you had it open. Note: You have to close the application and relaunch it for the changes to be seen. Now launch TextEdit and bring down the Edit or Format menu and take a look... Do some of the letters on the drop down menu have rainbow colored edges? Slightly colorful edges and not black or dithered grey? This seems to be a problem when in Vista with bootcamp as well. The driver version does not matter, since I am running the new catalyst drivers in bootcamp and the older drivers used by Apple in OSX. I have also tried both ports on the 4870, the mini and DVI, no difference. I think this could be a problem with certain cards, or maybe even with all cards. Not sure really. It'll show up when doing word processing. Pretty annoying. Thanks for checking this out.