This paper describes the next generation Intel<sup>reg</sup> micro-architecture (Nehalem) 45 nm IA processorpsilas 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<sup>reg</sup> QuickPath interconnect and Intel<sup>reg</sup> QuickPath memory controller clock generation, and jitter-attenuating DLLs.