Hardware Requirements for Mac OS X v10.4 Tiger

Make sure your hardware can run Mac OS X Version 10.4

Mac OS X Version 10.4 requires a Macintosh with:
• PowerPC G3, G4, or G5 processor
• Built-in FireWire
• At least 256MB of physical RAM
• A built-in display or a display connected to an Apple-supplied video card supported by your computer
• At least 3.0 GB of available space on your hard drive; 4GB of disk space if you install XCode 2 developer tools
• DVD drive for installation (get CD media for $9.95) for more information see the link below.

Note: Mac OS X does not support processor upgrade cards. The amount of disk space required depends on your computer and the way you are installing Mac OS X.

http://www.apple.com/macosx/upgrade/requirements/ for more information.