Many AthlonXP's these days are coming SMP-locked. However, the SMP lock isn't all that hard to defeat; <A HREF="http://www.hardwarezone.com/articles/articles.hwz?cid=2&aid=393&page=2" target="_new">here</A>'s how to unlock it. It's the same trick that's used with the L1 bridges.
Once you do this, you should have an SMP-ready AthlonXP. There's a slight chance of problems, simply because of AthlonXP's possibly not being SMP-tested, but very few people have reported problems once they actually got SMP to work.
As for the Tyan 760MPX...if you don't need 64-bit PCi, you might as well go with an older 760MP chipset, such as Tyan's first Tiger 760MP motherboard. It's an extremely stable product with more maturity than the 760MPX, and any 64-bit PCI slots on a 760MP motherboard are fully capable of holding 32-bit PCI cards.
<pre>We now <b>return</b>(<font color=blue>-1</font color=blue>) to an irregular program scheduler.</pre><p>