Check out the Sonnet Cresendo, which is a PPC on a PCI card. I'm under the impression that it and the SharkPPC might be the same thing!
That's a common misconception of the Sonnet Cresendo. The PCI label only means it works in the original PCI based Macs. It uses the Processor slot, which is not PCI. It's a dedicated slot similiar to the way that A3/4k's have processor slots. But it is a nice card. I've got the NewerTech G3 version in my Mac 8500.
