IBM POWER architecture

Instruction set

IBM POWER is a reduced instruction set computer (RISC) instruction set architecture (ISA) developed by IBM. The name is an acronym for Performance Optimization With Enhanced RISC. The ISA was used for high-end IBM microprocessors during the early 1990s and were used in many of IBM's servers, minicomputers, workstations, and supercomputers. These processors are called POWER1 (RIOS-1, RIOS.9, RSC, RAD6000) and POWER2 (POWER2, POWER2+ and P2SC). The ISA evolved into the PowerPC instruction set architecture and was itself deprecated in 1998, when IBM introduced the POWER3 processor that was mainly a 32/64-bit PowerPC processor but included IBM POWER architecture features for backwards compatibility.

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