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This paper describes the Next generation Intel® micro-architecture (Nehalem) 45nm IA processor's Core and I/O clocking architecture. Among the highlights are: configurable clocking, fastlock low-skew PLLs, high reference clock frequencies, analog supply tracking system, adaptive frequency clocking, low jitter Intel® QuickPath interconnect and Intel® QuickPath memory controller clock generation, and jitter-attenuating DLLs.