I have this Power Computing PowerBase 200 that is in dire need of *something* (I either fix it or get rid of it, I'm tired of having it sit around), so I looked around on eBay for a new logic board. I found one from a PowerCurve that looks vaguely similar, but I wanted to ask if anybody knows definitively if it is a drop in replacement which is compatible with the riser and CPU cards

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The PowerBase is a very different machine from the PowerCurve.

That said, the CPU cards will probably work. It's been a long time, but as I recall, PCC used a couple of the multi-processor signal lines in the CPU slot to handle the different CPU signals that the PowerBase or maybe the Catalyst boards (Curve, Center, Center Pro) needed.

I don't know about the riser cards. It depends on where PCC cut the bus. PCI is PCI, so if PCC cut the bus after the PCI controller, then the riser cards are probably compatible. That would keep things cheapest for them.