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About this part:

> In 2004, Intel wrote off the Itanium and cloned AMD64.

AMD introduced x86-64 in 2003. You don't just clone an ISA (even if based on AMD documents), design it, fab it etc. in a year or two. Intel must have been working on this well before AMD introduced the Athlon64.



The ISA was published in 2000, there was plenty of time to start working on an implementation before AMD shipped actual product.


Thanks! I didn’t know AMD published it that early, but that makes much more sense then Intel “cloning” it as a reactive move to Athlon64 having it.

(Though you could certainly make the case that it was reactive move by Intel marketing to enable it.)




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