alt Hacker NewsAnother interesting episode "after the 486" was the switch from 32 bit to 64 bit, where Intel wanted to bury the ghost of the 8086 once and for all and switched to a completely new architecture (https://en.wikipedia.org/wiki/IA-64), while AMD opted to extend the x86 architecture (https://en.wikipedia.org/wiki/X86-64). This was probably the first time that customers voted with their feet against Intel in a major way. The Itanium CPUs with the new architecture were quickly rechristened "Itanic" and Intel grudgingly had to switch to AMDs instruction set - that's the reason why the current instruction set still used by all "x86" CPUs is often referred to as AMD-64.
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If this is true or not I don't know, but I worked on a project with an HP employee and we were talking about the Itanium. At some point the HP guy goes "You know we more or less designed that thing, right?"
I would tend to believe that the Itanium is an HP product, given that they've always seems more invested in the platform than Intel.
What I find interesting is that Intel engineers actually designed their own 64-bit extension, somewhere along the same lines as AMD64.
Intel's marketing department threw a fit, they didn't want the Pentium 4 competing with their flagship Itanium. Bob Colwell was directly ordered to remove the 64-bit functionality.
Which he kind of did, kind of didn't. The functionally was still there, but fused off when Netburst shipped.
If it wasn't for AMD beating them to market with AMD64, Intel would have probably eventually allowed their engineers to enable the 64-bit extension. And when it did come time to add AMD64 support to the Pentium 4 (later Prescott and Cedar Mill models) the existing 64-bit support probably made for a good starting point.
Bob Colwell talks about this (and some of the x86 team vs Itanium team drama) in his quora answer and followup comments: https://www.quora.com/How-was-AMD-able-to-beat-Intel-in-deli...