# Difference entre i386 & i686

**URL:** <https://www.debian-fr.org/t/difference-entre-i386-i686/14766>\
**Category:** Pause Café\
**Created:** [Février 20, 2016, 5:52 UTC](https://www.debian-fr.org/t/difference-entre-i386-i686/14766 "2016-02-20T17:52:13Z")\
**Posts on this page:** 1\
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**Author:** ![Lucci](https://www.debian-fr.org/letter_avatar_proxy/v4/letter/l/85f322/32.png) [@Lucci](https://www.debian-fr.org/u/Lucci)\
**Post date:** [Février 20, 2016, 5:52 UTC](https://www.debian-fr.org/t/difference-entre-i386-i686/14766/2 "2016-02-20T17:52:14Z")

</div>

## _FROM GCC 3.4 MANUAL_ 3.17.11 Intel 386 and AMD x86-64 Options

These `-m’ options are defined for the i386 and x86-64 family of  
computers:

`-mtune=CPU-TYPE’  
Tune to CPU-TYPE everything applicable about the generated code,  
except for the ABI and the set of available instructions. The  
choices for CPU-TYPE are:  
_i386_  
Original Intel’s i386 CPU.

```
_i486_
      Intel's i486 CPU. (No scheduling is implemented for this
      chip.)

_i586, pentium_
      Intel Pentium CPU with no MMX support.

_pentium-mmx_
      Intel PentiumMMX CPU based on Pentium core with MMX
      instruction set support.

```

_i686, pentiumpro_  
Intel PentiumPro CPU.

```
_pentium2_
      Intel Pentium2 CPU based on PentiumPro core with MMX
      instruction set support.

_pentium3, pentium3m_
      Intel Pentium3 CPU based on PentiumPro core with MMX and SSE
      instruction set support.

_pentium-m_
      Low power version of Intel Pentium3 CPU with MMX, SSE and
      SSE2 instruction set support. Used by Centrino notebooks.

_pentium4, pentium4m_
      Intel Pentium4 CPU with MMX, SSE and SSE2 instruction set
      support.

_prescott_
      Improved version of Intel Pentium4 CPU with MMX, SSE, SSE2
      and SSE3 instruction set support.

_nocona_
      Improved version of Intel Pentium4 CPU with 64-bit
      extensions, MMX, SSE, SSE2 and SSE3 instruction set support.

_k6_
      AMD K6 CPU with MMX instruction set support.

_k6-2, k6-3_
      Improved versions of AMD K6 CPU with MMX and 3dNOW!
      instruction set support.

_athlon, athlon-tbird_
      AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and SSE
      prefetch instructions support.

_athlon-4, athlon-xp, athlon-mp_
      Improved AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and
      full SSE instruction set support.

_k8, opteron, athlon64, athlon-fx_
      AMD K8 core based CPUs with x86-64 instruction set support.
      (This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and
      64-bit instruction set extensions.)
_winchip-c6_
      IDT Winchip C6 CPU, dealt in same way as i486 with additional
      MMX instruction set support.

_winchip2_
      IDT Winchip2 CPU, dealt in same way as i486 with additional
      MMX and 3dNOW! instruction set support.

_c3_
      Via C3 CPU with MMX and 3dNOW! instruction set support. (No
      scheduling is implemented for this chip.)

_c3-2_
      Via C3-2 CPU with MMX and SSE instruction set support. (No
      scheduling is implemented for this chip.)

 While picking a specific CPU-TYPE will schedule things
 appropriately for that particular chip, the compiler will not
 generate any code that does not run on the i386 without the
 `-march=CPU-TYPE' option being used.

```

(edit)  
[un lien](http://gcc.gnu.org/onlinedocs/gcc/i386-and-x86_002d64-Options.html)

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