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The PowerPC 620 was a 64-bit microprocessor implementing the entire PowerPC Architecture and a sub-set of the POWER Archictecture. It was to have been built by IBM, but was never widely available and never made it into the Apple Macintosh architecture, the largest user of PowerPC chips at the time, since it did not keep pace with the high-performance 32-bit PowerPC 604 and 604e. As a result, the first mainstream 64-bit PowerPC chip was the PowerPC 970, marketed by Apple as the PowerPC G5.
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