System requirements for installing Mac OS X

Mac OS X can only be installed on Macintosh computers which are officially supported by Apple Inc., although a few unsupported utilities do exist.

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Installing Mac OS X 10.0.x
Hardware:
 * A Mac with a PowerPC G3 processor, except for the original PowerBook G3 and processor upgrade cards;
 * 128 MB RAM;
 * A minimum of 1.5 GB hard drive space;
 * Optical drive

Software:
 * Mac OS 9.1 to run the Classic environment; users of Mac OS 9.0.4 and earlier versions of Mac OS 9 must upgrade

Installing Mac OS X 10.2.x
Mac OS X 10.2 "Jaguar" requires:
 * Power Mac G3 or G4, iMac, eMac, PowerBook G3 or G4, or iBook computer with 128 MB of physical RAM.

Footnotes:
 * 1) Supported video cards: nVidia GeForce2 MX, GeForce3, GeForce4 MX, or GeForce4 Ti; any ATI AGP Radeon card. A minimum of 16 MB video RAM required. (This is only for Quartz Extreme support; any graphics card will work.)
 * 2) A QuickTime 6 Pro key is required for QuickTime Pro functionality. The QuickTime 5 Pro key will not work after this software is installed.
 * 3) Requires a DVD-ROM-equipped Macintosh with built-in FireWire.
 * 4) Features or content provided by Sherlock may change or be discontinued at any time.
 * 5) The original PowerBook G3 ("Kanga") and processor upgrade cards are not supported. (This should read: "Apple won't provide support for Mac OS X on the Kanga or with processor upgrade cards.)

Installing Mac OS X 10.4.x
Installing Mac OS X "Tiger" requires:
 * A Mac with a PowerPC G5, G4 or G3 processor; built-in FireWire; and 256 MB of physical RAM.

Footnotes:
 * 1) Some features require a compatible Internet service provider; fees may apply.
 * 2) Video conferencing requires a compatible FireWire DV camera or web camera and broadband Internet access. One to one video conferencing requires a G5, G4 or 600 MHz or faster G3 processor and 100 Kbps or faster Internet access. Initiating a multiway video conference requires a G5 or dual 1 GHz or faster G4 processor and 384 Kbps or faster broadband access. Participating in a multiway video conference and initiating a 6-person multiway audo conference both require a G5, 1 GHz G4, or dual 800 MHz or faster G4 processor and 100 Kbps of faster broadband access.
 * 3) Requires .Mac account.
 * 4) QuickTime Pro requires QuickTime 7 Pro key. QuickTime 6 Pro key will not work after this software is installed.
 * 5) Processor upgrade cards are not supported. (Rather, as always, this should read "Apple won't provide support for machines with processor upgrade cards.)

This is the first version of Mac OS X to ship on a DVD. However, for $9.95, the DVD can be traded in for a five CD set for installation on Macs without DVD drives.