When AMD released the (the first x64 chip) in 2003, it solved a problem Intel had ignored. Intel's Itanium was notoriously bad at running old 32-bit software—it was slow and expensive. AMD's solution ran 64-bit code and 32-bit code at full speed.
AMD began working on this extension (code-named x86-64 ) in secret. The project was led by a brilliant architect named Kevin favor (often credited along with Phil Rogers), but the implementation in the silicon was a masterpiece of efficiency. wub x64
Understanding Wub x64: The Complete Guide to Windows Update Blocker When AMD released the (the first x64 chip)
