64bit P4 vs mfsBSD

Valeri Galtsev galtsev at kicp.uchicago.edu
Fri Aug 7 20:08:42 UTC 2015

On Fri, August 7, 2015 2:17 pm, Quartz wrote:
>>> If you look up the id from cpuid on ark.intel.com, you should get
>>> a definitive answer.
>> If you look up the Atom E6xx CPUs (used e.g. in the Soekris net6501),
>> that site claims that they are 32 bits only.  In reality, these
>> CPUs do support 64-bit mode, as numerous owners can testify to.
>> As other people have said, the presence of long mode in the CPU ID
>> flags tells the true story.
> While we're at it, intel's util says this is a P4 541 and that it's
> family 15 model 4 (a claim shared by every OS I've run on it) whereas
> wikipedia claims the 541 is family 15 model *3*.

Intel is the manufacturer of that chip. Wikipedia's information is
maintained by random bunch of individuals (with respect to the job they
are doing...). The choice of primary source of information seems to be
obvious. I would verify on intel website what model number 541 resembles
to though (yes, I know, getting information wise their website is ugly
compared to wikipedia...)


Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247

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