Hello, If we use Window 7 on imac 3 , will it effect the efficiency of i mac.
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Whether or not it does, it totally takes away the whole point of owning a Mac. Try running it as a Virtual Machine before installing it fully - it will take up less resources. How much RAM do you have in there?
This topic has been moved from the section Windows 7 to section Mac OS X by Grumpy9117
Plus you paid a huge price premium on the hardware just to run Windows...