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Once upon a time there was a microprocessor architecture called PowerPC. Created in early 1990's by Apple, IBM and Motorola alliance, it was a modern 32-bit superscalar RISC CPU derived from high-end server IBM POWER processors. Many believed that PowerPC will be the future of desktop computing, but even though it performed on par or better in comparison to other desktop architectures, this future never happened.
After Apple left PowerPC for Intel x86/x64 in 2006, it quickly disappeared from the mainstream desktop. At the same time seventh generation of gaming consoles entered the market and chips based on PowerPC core were used in all of them (Sony PS3, Microsoft XBox360, Nintendo Wii) as well as in various embedded devices (high performance network appliances, automotive, ...). PowerPC was merged back with IBM Power and high-performance server market is the only area where the architecture plays an important role, four of top ten supercomputers in famous Top500 list are Power-based.
Today (2015) there is just handful of Power-based desktop motherboard in production (AmigaOne X1000, Sam 440/460) and only one gaming console of current generatin (Nintendo Wii U). But many still use older computers and this humble website aims to provide some basic information for them.