> from what i understand of these CPUs, they are still based on a 486 core, and
> aren't actually Pentium class CPUs even though they may give pentium class
> performance.  just think of them as souped up 486 chips.

 The Cyrix 6x86 is a Pentium-alike CPU and has not much in common with the
i486 - no more than a regular Pentium has. It has also Pentium commands
and similar pipeline behaviour. Only the branch prediction is better
and faster, which gives the 6x86 a sligth advantage. The 6x86 is also
pin-compatible to the Pentium.

 The 5x86 is i486-alike.

 The Cyrix yx86 clones are based on a risc core, which emulate the targetted
CPU. Which you may have gotten as "486 core".

-- 
Markus Illenseer