AMD64 technology, originally called x86-64, is a set of extensions that allows the CPU to run as a 64-bit microprocessor. The AMD64 technology includes the following extensions:
The advantages of 64-bit mode over the 32-bit mode:
Intel released their own set of 64-bit extensions which was called Extended Memory 64 technology (EM64T). In 2006 the EM64T was renamed to Intel 64. Intel's EM64T and "Intel 64" are mostly compatible with the AMD64 technology.
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