The 500 MHz model was reintroduced on February 16, 2000. The incident generated a rift in the Apple-Motorola relationship, and reportedly caused Apple to ask IBM for assistance to get the production yields up on the Motorola 7400 series line. The Power Mac series was downgraded abruptly from 400, 450, and 500 MHz processor speeds to 350, 400, and 450 MHz while problems with the chip were ironed out. This forced Apple to take back the advertised 500 MHz models of Power Mac G4.

Motorola had promised Apple to deliver parts with speed up to 500 MHz, but yields proved too low initially. The die measures 83 mm 2 and features copper interconnects. The chip operates at speeds ranging from 350 to 500 MHz and contains 10.5 million transistors, manufactured using Motorola's 0.20 μm HiPerMOS6 process. The PowerPC 7400 (code-named 'Max') debuted in August 1999 and was the first processor to carry the 'G4' moniker. Besides desktop computers the PowerPC G4 is popular in embedded environments, like routers, telecom switches, imaging, media processing, avionics and military applications, where one can take advantage of the AltiVec and its SMP capabilities. The PowerPC G4 processors are also popular in other computer systems, such as the AmigaOne series of computers and the Pegasos from Genesi.

The PowerBook G4 has been replaced by the Intel-based MacBook Pro. The last portable to use the G4 was the iBook G4 but was replaced by the Intel-based MacBook. The last desktop model that used the G4 was the Mac Mini which now comes with an Apple M1 processor. PowerPC G4 processors were also used in the eMac, first-generation Xserves, first-generation Mac Minis, and the iMac G4 before the introduction of the PowerPC 970.Īpple completely phased out the G4 series for desktop models after it selected the 64-bit IBM-produced PowerPC 970 processor as the basis for its PowerPC G5 series. Macintosh computers such as the PowerBook G4 and iBook G4 laptops and the Power Mac G4 and Power Mac G4 Cube desktops all took their name from the processor. Motorola and Freescale's proper name of this family of processors is PowerPC 74xx. Apple has applied this name to various (though closely related) processor models from Freescale, a former part of Motorola. PowerPC G4 is a designation formerly used by Apple and Eyetech to describe a fourth generation of 32-bit PowerPC microprocessors.

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