A. Dual Mode processor<\/p>\n
B. X- 86 processor<\/p>\n
C. X-86-64 processor<\/p>\n
D. Itanium Processor<\/p>\n
X86-64 processors are hybrid CPUs that can execute 32 bit as well as 64bit instructions. X86 is 1970s\u2019-introduced 32-bit instruction set architecture by Intel for x86. The 64 corresponds to the x86-64 or AMD architecture extensions formulated in early 2000s.<\/p>\n
The X86-64 processors are backwards compatible with the 32-bit x86 software. However, they can also operate new 64-bit software enabling greater use of memory. They provide flexibility and enable a smooth transition from one bit to another.<\/p>\n
But AMD and Intel worked together to produce the X86-64 architecture. In 2003, AMD debuted the first X86-64 processor called \u2018AMD64\u2019. Intel later adopted AMD\u2019s architecture and it was called Intel 64 by the company. Therefore, X86-64 and AMD 64 mean the same thing as a 128 bit instruction set.<\/p>\n