Latest thrift store find - Ruby iMac (400MHz G3)

Effectively, yes, because I don't believe Apple has ever released a G3 of that speed, part of the reason I believe the 867 number to be arbitrary (it gives them a convenient way to exclude G3s from Leopard's constituency without having to ban them by name). However, I am fairly certain that there's nothing in Leopard that demands AltiVec, so if you fool the Installer with OpenFirmware it will probably work. This thread http://forums.macrumors.com/showthread.php?s=4be4aa41116f02bf359983d40387ab… claims that swapping out the hard disks from a successful install lets it run on a G3, but it crashes a lot. However, I wonder if that is more due to unexpected hardware being present/absent than a processor limitation. Nevertheless, I'm sure its performance on a G3 would be charitably called pedestrian. For the record, I believe Apple's fastest G3 was ~700MHz.