hardware, instead of the industry-standard C13 connector used with personal computers. The official end to the Power Macintosh line came at the 2006 Worldwide Developers Conference, where Phil Schiller introduced its replacement, the Mac Pro. The G5's enclosure design was retained for the Mac Pro and continued to be used for seven more years, making it among the longest-lived designs in Apple's history. Models The Power Macintosh models can be broadly classified into two categories, depending on whether they were released before or after Apple introduced its "four quadrant" product strategy in 1998. Before the introduction of the Power Macintosh G3 (Blue and White) in 1999, Apple had shipped Power Macintosh-labelled machines in nine different form factors, some of which were carry-overs from pre-PowerPC product lines, such as the Quadra/Centris 610 and the IIvx. This was reduced to one model in the new product strategy, with the exception of the Power Mac G4 Cube in 2000 and 2001. 1994–1997 Apple named Power Macintosh models from this period after the first pre-PowerPC model of Macintosh to use a particular form factor, followed by a slash and the speed of the CPU. For example, the Power Macintosh 6300/120 uses the Quadra 630's form factor and has a CPU. Machines with "AV" in their name denote variants that include extended audio-video capabilities. Machines with "PC Compatible" in their name include a separate card with an x86-compatible CPU; these models are therefore capable of running MS-DOS and Microsoft Windows applications, typically Windows 3.1. Machines with "MP" in their name denote machines that include two CPUs. These early models had two distinct generations. The first generation uses the PowerPC 601 and 603 processors and used the old NuBus expansion slots, while the second generation uses the faster 603e, 604 and 604e chips as well as industry-standard PCI expansion slots. The second generation also makes use of Open Firmware, allowing them to more easily boot alternate operating systems (including OS X via XPostFacto), though use of various hacks was still necessary. Power Macintosh 4400 The Power Macintosh 4400 is a desktop case with a height of , suitable for horizontal placement with a monitor on top. Power Macintosh 4400/160, 200, 200 (PC Compatible) (Marketed as the Power Macintosh 7220 in some regions) Power Macintosh 5200 The Power Macintosh 5200 is an all-in-one form factor with specifications and internal designs similar to the Quadra 630. Collectively these