I was however lucky enough to be able to get a Tyan Tiger MPX alongside a couple of 'Morgan' core Durons... Can't remember if they were 1.0 or 1.2GHZ... But wow that thing was -nice- on Windows 2000 and held up better than most than other systems I built in that era (Although, in retrospect that may have been because most other builds I did suffered from the capacitor plague...)
The -intended- purpose was Dual Athlon MPs.
That said, AFAIK some early AXPs could be used, many later ones could have the bridges 'repaired' to allow dual operation.
Early Morgan core (Model 7) Durons however could also run MP.
One big pain point however, the built in USB was broken on early revs (but hey, they bundled a PCI USB2.0 card to compensate) but also the chipset was... -meh-.
But wow it was a solid board!