Mac+Tech
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  OS X – Upgrade Requirements  
    Apple’s stated minimum requirements for Panther (10.3), Tiger (10.4), and Leopard (10.5), are different. But none of them really don’t go as far as I think they should.  
 

OS X Tiger

     
    OS X 10.5 (Leopard)  
   

Apple says to use Tiger your Macintosh needs:
• A PowerPC 867MHz (or faster) G4, or G5 processor, or an Intel processor
• DVD drive for installation
• 512MB of RAM
• 9GB of free disk space
• Some features require an Intel processor. Others require built-in or compatible video camera, Internet service, and/or a .Mac account.

 
    Mac+Tech suggests you limit Leopard installations to 1.33 GHz or faster G4 processors with at least 1GB of RAM, but preferably 2GB or more RAM. 2-4GB of RAM is helpful when running Windows on an Intel Mac.  
       
    OS X 10.4 (Tiger)  
   

Apple says to use Tiger your Macintosh needs:
• A PowerPC G3, G4, or G5 processor, or an Intel processor
• Built-in FireWire
• At least 256 MB of RAM
• DVD drive, Combo CD/DVD drive, or SuperDrive for installation
• At least 3GB of free disk space; 4GB if you install the Developer Tools
• Mac+Tech suggests buying a faster Mac instead of installing a processor upgrade.

 
    Mac+Tech suggests you limit Tiger installations to 800MHz or faster G4 processors with at least 512 MB of RAM*, but preferably 1 GB or more RAM. 2-4GB of RAM is helpful when running Windows on an Intel Mac.  
       
    OS X 10.3 (Panther)  
    Apple says to use Panther your Macintosh needs:
• A PowerPC G3, G4, or G5 processor
• Built-in USB
• At least 128MB of RAM
• CD drive, Combo CD/DVD drive, or SuperDrive for installation
• Mac+Tech suggests buying a faster Mac instead of installing a processor upgrade.
 
    *Mac+Tech suggests you do not install any OS X version lower than 10.3.9 on any Mac. Panther is quickly becoming obsolete (not supported by newer software). Because of this, it Tiger may be a better choice even on a Mac that doesn't fully meet my recommended specs for it. Replacing Panther with a newer Intel Mac is becoming more and more attractive.  
 
 
     

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