There are rumours that the Sonnet 7200/4400 G3 upgrade - that actually goes into a PCI slot - has been made to work in other machines. IIRC, someone on the 6400zone forums got it working.

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Actually that card was only marketed to 7200 not 4400. Sonnet had L2 slot G3 for 4400. This thread documents usage of the 7200 card in a 7500. He said he'd try it out in a 6500, but the thread ends there. This is curious. There are even OS X possibilities mentioned in that thread. If you are willing to use the one PCI slot in your 6360, I say go for trying the Crescendo/7200. There was even a G4 variant! If you could get OS X to work with that, it would run pretty well. The issue would be the low RAM ceiling. If you are not willing to give up your PCI slot, go straight for the Crescendo/L2.