I recently bought a 733MHz PowerMac G4. It has 658MB RAM (soon to be upgraded to 1.5GB) and a 64MB ATI Radeon 7000 AGP video card.
Leopard installed just fine with that OF hack to make it think I had an 867MHz G4, and it runs surprisingly quickly. There is, however, one small problem I've noticed:
Tooltips in the dock just refuse to display correctly! The same problem appears when using VNC to remote into the machine. I don't remember if I had this problem when using the 32MB nVidia card that came with the machine (that card was borked, so I replaced it with this ATI one). Anyone else see this problem? I've googled around for it, but haven't come up with anything thus far,