You know, that's probably a really good rule to go by. I can't think of any exceptions of Apple models that are genuine PPC designs and only have three numbers in the model number.

The "PowerBook 500" (an upgraded 520 or 540) shipped with a PowerPC, but it's really just a processor upgraded 68k.

The PowerPC upgraded Quadras reported themselves as three-digit PowerMacs...

In any case, the 8600 is indeed a PowerMac with a PowerPC.

I think I heard a question about the 950 in there, but it wasn't clear. Were you asking if the 950 w/ a PPC upgrade counts as a PowerPC Mac? It probably belongs in the one-off or NuBus forums...

Peace,
Drew
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Power to the PowerPC!