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Originally Posted by BlueApple
So in Leopard, there is only one Kernel, and it's 32-bit only?
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That's correct.
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I know for a fact that Leopard is capable of running X86_64 binary, since I've compiled one and run it. In Activity Monitor, it does show "Intel (64-bit)" instead of just "Intel".
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Yes. Like I said, everything above the kernel can run in 64-bit. Unlike with most operating systems, the kernel does not have to be 64-bit in order for the machine to run 64-bit programs.