But I have a genuine copy of Windows XP SP3, I only need Windows for games. Just wondering if there are any other iMac 27" users with the 4850 Mobility chip from ATI and who are using Windows XP successfully? Is there the same problem of rubbish ATI drivers in Boot Camp 3.0 / 3.1? Is there another source to get 4850 Mobility drivers? Cheers ^_^ Found an OmegaDrivers.net source for Mobility / ATI drivers. Has anyone tried these with their iMac 27"? or iMac with 4850 Mobility?