ANSWERS: 2
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Unless I am mistaken, ALL of Apple's G5 and Intel based computers use 64-bit processors.
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"Leopard delivers 64-bit power in one universal operating system. Now the Cocoa application frameworks, as well as graphics, scripting, and the UNIX foundations of the Mac, are all 64-bit. And since you get full performance and compatibility for your 32-bit applications and drivers, you don’t need to update everything on your system just to run a single 64-bit application."
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