IBM POWER

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POWER is a RISC instruction set architecture (ISA) developed by IBM. The name is an acronym for Performance Optimization With Enhanced RISC.[1]

POWER is also the name of a series of microprocessors that implement the POWER ISA. The POWER series microprocessors are used as the CPU in many of IBM's servers, minicomputers, workstations, and supercomputers. The POWER3 and subsequent microprocessors in the POWER series all implement the full 64-bit PowerPC architecture. The POWER3 and above do not implement any of the old POWER instructions that were removed from the ISA when the PowerPC ISA came out or any of the POWER2 extensions such as lfq or stfq.

Appendix E of Book I: PowerPC User Instruction Set Architecture of PowerPC Architecture Book, Version 2.02 describes the differences between the POWER and POWER2 instruction set architectures and the version of the PowerPC instruction set architecture implemented by the POWER5.

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