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Re: CPU Designations



286, 386 and 486 are, well, kinda what they say. Intel didn't start giving processors names until Pentium. Something to do with them no being able to copyright numbers as I recall.

The original Pentium and Pentium MMX CPUs are i586. As are AMD K6 and K6-2/3 and so on.

Pretty much everything from the Pentium II onwards (not counting x86 64bit CPUs, I have no idea what they'd be designated) is classed as i686. PII, PIII, P4, AMD K7 (Athlon, Thunderbird etc.) and so on.

If I remember correctly, the x86 designation is the instruction set the processor is compatable with. With higher generations generally being able to execute code compiled for previous generations? 

Will.


----- Original Message ----- 
From: "Krautkramer, John" <John Krautkramer Micrel Com>
To: <redhat-list redhat com>
Sent: Wednesday, March 17, 2004 3:26 PM
Subject: CPU Designations


> Hi,
> 
> I realize this is a very basic question but here goes...
> 
> What are the CPU designations expressed by:
> 
>     i286, i386, i486, i586, i686, etc.
> 
> I assume the first 2 are Pentium II and Pentium III respectively. What specifically are the others? I have the latest  Pentium 4 with hyperthreading. What is that CPU in this naming scheme?
> 
> Thanks in advance!
> 
> John
> 
> 
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