Andrew McLaren

"cquirke (MVP Windows shell/user)" <cquirkenews@nospam.mvps.org> wrote ...
> On Sun, 5 Aug 2007 22:01:28 +0100, "Synapse Syndrome"
>
>>Yes, as he said. Only the later versions of the Prescott core, which was
>>the last Pentium 4 core, had the NX bit.
>
> There was at least one further fabrication shrink after Prescott.


That's a total fabrication (sorry, I couldn't resist :-).

Actually, you're both right ... the "Cedar Mill" revision came after
Prescott. But all Cedar Mill Pentium 4s used the EM64T architecture, so they
are excluded from the class of "purely 32-bit Pentium 4s". All 64-bit
Pentium 4 CPUs supported Hardware DEP via the XD bit (aka, NX bit). Prescott
is indeed the last, of the 32-bit only Pentium 4s.

I haven't seen any figures, but I suspect the numerical impact of Cedar Mill
CPUs shipped would be close to negligible.

--
Andrew McLaren
amclar (at) optusnet dot com dot au