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Microsoft first ported NT to IA-64 (Intel Itanium) and called it IA64. Next 64-bit port was AMD's x86-64 which they called x64. At the time AMD called it AMD64
by kyberias 11y ago
Microsoft first ported NT to IA-64 (Intel Itanium) and called it IA64. Next 64-bit port was AMD's x86-64 which they called x64. At the time AMD called it AMD64 and Intel started to call it Intel64. The terminology really didn't stabilized at the time to "x86_64".
- EvanAnderson 11y agoThe PROCESSOR_ARCHITECTURE environment variable on x64 builds of Windows has always been "AMD64", however.
- yuhong 11y agoActually EM64T was used by Intel in the early days.
- nickpsecurity 11y agoThat's what I thought it was called when I looked it up to see if x64 was same thing. Typed in EM64T to get three or so more haha.