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is Core 2 Duo 2.4G i686 or x86-64?

In my macbook pro 2010, it has core2 duo cpu is this i686 or x86-64?

i am not sure~~~so i came here and ask. and also, I also see some term says amd64? what are differences among these?

thank you.

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check the manufacturer's website and try googling – Shekhar Feb 26 '12 at 6:26

It is Intel 64 (previously known as EM64T and IA32e). This instruction set is mostly compatible with AMD64 (previously known as X86-64). x86-64 is used as a vendor-neutral name for the common instructions.

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