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The zEnterprise EC12 is the latest generation of IBM's System z Enterprise Class mainframe servers. The microprocessor operates at an ultra-high frequency of 5.5 GHz and incorporates many pipeline-optimization and instruction-processing techniques. It also supports innovative instruction- set-architecture extensions for future software exploitation to acquire performance gains. This article highlights the various factors inside the zEC12 microprocessor for achieving the best possible computing performance.
Servers, Instruction sets, Microprocessors, Microprocessor chips, Optimization, Program processors, high-frequency microprocessor, microprocessors, IBM computers, mainframes, zSeries, zEC12, zEnterprise EC12, transactional memory, runtime instrumentation, branch prediction

C. Jacobi, F. Busaba and C. K. Shum, "IBM zEC12: The Third-Generation High-Frequency Mainframe Microprocessor," in IEEE Micro, vol. 33, no. , pp. 38-47, 2013.
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