IBM Power microprocessors

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IBM Power microprocessors (originally POWER prior to Power10) are designed and sold by IBM for servers and supercomputers.^[1] The name "POWER" was originally presented as an acronym for "Performance Optimization With Enhanced RISC". The Power line of microprocessors has been used in IBM's RS/6000, AS/400, pSeries, iSeries, System p, System i, and Power Systems lines of servers and supercomputers. They have also been used in data storage devices and workstations by IBM and by other server manufacturers like Bull and Hitachi.

The Power family was originally developed in the late 1980s, and remains under active development. In the beginning, they implemented the POWER instruction set architecture (ISA), which evolved into PowerPC and later into Power ISA. In August 2019, IBM announced it would open source the Power ISA.^[2] As part of the move, it was also announced that administration of the OpenPOWER Foundation will now be handled by the Linux Foundation.