What does Mac OS 10.5 support?

I have a G4 Power Mac AGP Sawtooth running 1.3 MHz with 2 GB RAM and 2 MB for L3. Does Mac OS 10.5 support my machine? If so, how much will the Mac OS slow down my machine?
Thank you in advance for your information.
Robert

If the 1.3 Ghz processor you put in does not act like a true PowerMac G4 1.3 Ghz in the view of the Leopard installer, it won't let you install. The processor needs specialized support from its manufacturer to allow Leopard to install, or third party software called Leopard Assist. Either way, you are building yourself a jalopy, because it is not officially tested as a configuration by Apple. Any updates you do past an unofficially tested configuration you are on your own or at the mercy of the vendor who supplied the processor.
Apple set the limit based on its built-in processors and its firmware. The firmware supplied by third party firmware for upgraded processors is different.

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