On my first 27" iMac, when running WIN7 via Boot Camp, I would get a gradient transition on my screen. Shades were not smooth and other users were getting the same. It was discovered that Boot Camp video drivers for WIN7 64bit were the problem and no one had an answer. Here I am 6 months later and wanting to buy the latest iMac 27 to run WIN7 Ultimate 64bit via Boot Camp. Have better or more current drivers be written to cure this problem or is it still the same. Decided against the Mac Pro if I can get the iMac to replace my existing iMac 21.