Detecting CPU Type

Garrett Cooper youshi10 at
Wed Jul 11 02:53:20 UTC 2007

RW wrote:
> On Tue, 10 Jul 2007 16:42:33 -0400
> Rob <r17fbsd at> wrote:
>> Olivier Regnier wrote:
>>> I searching to find information about my CPU type.
>>> i have this: CPU: Mobile AMD Sempron(tm) Processor 2800+
>>> (1600.06-Mhz 686-class CPU) I must configure my CPUTYPE?=
>>> in /etc/make.conf. I'ts i686 (686-class) or i386 ?
>> "i386" is the architecture;  it includes all the similar processors
>> including the 486, Pentiums, Athlon, etc.   Other architectures are
>> completely different hardware, eg Sun's SPARC.
>> The 686-class is the specific processor within the i386
>> architecture.  if you look in /usr/share/examples/etc/make.conf
>> you'll see a list of options for CPUTYPE.  athlon-xp might be the
>> closest to your cpu.  However, some folks here recommend against
>> using overly specific cpu optimization.  You can go safe and just use
>> pentium4
> I'm not sure that is safe, Athlons, Sempron etc are back-compatible to
> 686 i.e. Pentium Pro, which is way before Intel developed the Pentium4.
    Use athlon-xp (hyphen or no hyphen? I forget..).

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