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I believe from Apple officially it would be the dual 1.25ghz MDD G4. I had one new, and still have it running today!

And, unofficially, MacOS9Lives can boot directly to OS 9 on FW800 PowerMacs, which have 1.42GHz processors with 2x the L3 cache. Officially, those machines only supported OS 9 via Classic.

I used it to install OS 9 on my G4 Mac mini, and, aside from an annoying bug where the USB mouse is completely unresponsive after booting 50% of the time, it works great.

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