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Simultaneous multithreading (SMT) is an advanced processor microarchitecture feature that allows independent execution threads to more effectively utilize a superscalar CPU pipeline organization. SMT implementations in a 2-way superscalar pipeline maximize dual-thread concurrency with relatively little incremental dynamic power dissipation. This session focuses on the SMT capabilities included in the next-generation Power Architecture e200z9 processor core, and the improved performance/power metric achievable through this microarchitecture.