P-IV is i386 or i686?

Felipe Alfaro Solana lkml at mac.com
Tue Feb 8 20:12:41 UTC 2005


On 8 Feb 2005, at 19:42, Rajev Mhasawade wrote:

> Hi,
> while downloading i came across the terms i386 and i686.What is
> P4,i686 or i386?Since download is quite heavy i dont want to take
> chance.Plz tell me!

Strictly speaking,

i386 = Intel 80386
i486 = Intel 80486, adds a few instructions
i586 = Intel Pentium, adds a few instructions not available in 80486
i686 = Intel Pentium II and III, adds a few instructions not available 
in Pentium
i786 ~= Intel Pentium IV, adds a few instructions not available in 
Pentium II or III

RPM packages for i386 are targeted to any Intel 80386 processor or 
newer. RPM packages for i686 are compiled using instructions from the 
80386 instruction set, but the code is optimized for an Intel Pentium 
or newer processor.




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