I looked at the link to the PIOS. I think that the 604ev at 300 MHz statement and the dual processor statement are independent of each other. In other words, the PIOS comes with a single 604ev (interesting in itself; I thought only Apple shipped those) but the base machine has the ability to use dual processors. This is emphasized on the Umax S900 clones (clone of a clone) because the motherboard has two CPU slots. They're not actually any more capable of dual processors than any other X500 (PowerSurge) based machine. It's just more obvious.

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Yes, and if the Umax secondary processors are scarce as hens' teeth (which they are), the secondary processor in the Pios would be even scarcer (& needing connection with a similarly unfindable ribbon?). Most likely very few machines shipped at all, and fewer still with two 604ev cards in them.

On the other hand, the machine in question seems to me to be buckets more capable than the Umax clones, because presumably those can't accept a 604ev processor, in the same way that a 7500, say, cannot. There's a significant difference between the 604e and the 604ev, involving more than just 100 MHz. The whole chip was re-engineered.

Still, it's nice to dream of a Pios dual 604ev @ 300MHz out there waiting to be "liberated." Wait for me, baby, wait for me....

Apologies for the double post earlier, by the way.