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Message: <blockquote data-quote="Anusha" data-source="post: 2053253" data-attributes="member: 828">Both AMD and Intel are not true 64bit architectures. Only Intel Itanium processors are the true 64bit CPUs available in the market.AMD and Intel both are using x86-64, which is only an extension to the x86 architecture. Maybe Intel came up with the name EM64T at first only allowing RAM over 4GB with no potential 64bit benefits. I am not sure about it. But current x64 CPUs from Intel (Core 2's) speed up execution when 64bit code is present. They can execute 32bit code natively, which is something Itanium processors can't do.Both AMD and Intel desktop processors have "some" 64bit registers for 64bit code execution. I read somewhere that Core 2's require one additional clock cycle for executing 32bit code (which means it "likes" 64bit code), but I'm not so sure about it.</blockquote>

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