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The AMD64 or x86-64 or x64 is a 64-bit processor architecture invented by AMD.  AMD64 is designed to enable simultaneous 32- and 64-bit computing with no degradation in performance. With Direct Connect Architecture, AMD64 processors address and help eliminate challenges and bottlenecks related to system architectures because everything is directly connected to the central processing unit.

Also see All About Dual-Core Processors in Webopedia's "Did You Know...?" section.

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