Interviewed by CNN on 22/04/2011 17:58, Robert Kaiser told the world:

> Interesting, as AFAIK all Core architecture chips support EM64T - could 
> be that it's only Core2 though and Apple shipped some of the older 
> "crap" that was called "Core" but wasn't actually a new architecture at 
> all (and I know for sure that Core2 has EM64T).

That's right. The first generation of Intel Core CPUs was actually based
on an enhanced P6 (Pentium Pro/II/III) architecture codenamed "Yonah",
which was 32-bit only. Some of the early "Pentium Dual-Core" were also
P6-based.

The new "Core" architecture debuted only on the Core 2. AFAIK, it's an
evolution of the Yonah with, among other things, 64-bit extensions
added. So it's still a descendant of the venerable Pentium Pro.

Although Intel had a really, really confusing policy for a while, in
which it was hard to guess if a given CPU was 64-bit capable, had
hardware virtualization and other stuff -- they disabled features from
some chips aiming for market segmentation. So I wouldn't swear that all
Core 2 and later are actually 64-bit capable, because some of them may
have this feature disabled.

-- 
MCBastos

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