Power Mac G5

The Power Mac G5 was Apple's marketing name for models of Power Macintosh computers which contained the IBM PowerPC G5 processor. This professional-grade computer was the most powerful in Apple's lineup when it was introduced, widely hailed as the first 64-bit PC, and was touted by Apple as the fastest personal computer ever built.

Product history
The Power Mac G5 was officially launched during Steve Jobs' keynote presentation on June 23 at the 2003 Worldwide Developers Conference in June 2003. It saw three revisions to the line before being retired in August 2006 to make way for its Intel-based replacement, the Mac Pro. The Power Mac G5 had an anodized aluminium chassis that was dubbed the "cheese grater", which was largely carried over into the Mac Pro line. It was the final desktop manufactured by Apple to use a PowerPC processor.

2.0 GHz dual-core versions were appropriated by Microsoft as early Alpha Xenon Development Kits (XeDK) for internal development when the intended PowerPC-based  processors were not yet ready.