Yes g4's exist for Nubus, a slow one not worth bothering with (240Mhz?). Any apps that would make use of a G4 would choke on a Nubus machine.
If you already have the CPU then stick it in and see how it goes. It might turn out that the CPU boost is not what as expected and further money sunk into the project might not be worth it. I still upgrade my PCI macs, but the cost is almost nothing since people are dumping them for free or almost free. I would love a G4 1Ghz for my 8500 (currently with a g3-400) but I sure as heck would not pay much for it since a real G4 with a 133Mhz memory bus would be a much better investment.
From a collectors standpoint it is better to wait for equipment to get to the worthless for "real" work stage and snag it then to grab it when it is still usable or has gone up in value as a collectors item. I might have waited too long to snag a 9600.
From a users standpoint it rarely is worth it to upgrade machines more then 5 years old with prices so cheap today.
If you already have the CPU then stick it in and see how it goes. It might turn out that the CPU boost is not what as expected and further money sunk into the project might not be worth it. I still upgrade my PCI macs, but the cost is almost nothing since people are dumping them for free or almost free. I would love a G4 1Ghz for my 8500 (currently with a g3-400) but I sure as heck would not pay much for it since a real G4 with a 133Mhz memory bus would be a much better investment.
From a collectors standpoint it is better to wait for equipment to get to the worthless for "real" work stage and snag it then to grab it when it is still usable or has gone up in value as a collectors item. I might have waited too long to snag a 9600.
From a users standpoint it rarely is worth it to upgrade machines more then 5 years old with prices so cheap today.