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We describe the 4th Generation Intel® Core™ processor family (codenamed "Haswell") implemented on Intel® 22 nm technology and intended to support form factors from desktops to fan-less Ultrabooks™. Performance enhancements include a 102 GB/sec L4 eDRAM cache, hardware support for transactional synchronization, and new FMA instructions that double FP operations per clock. Power improvements include Fully-Integrated Voltage Regulators ( 50% battery life extension), new low-power states (95% standby power savings), optimized MCP I/O system (1.0-1.22 pJ/b), and improved DDR I/O circuits (40% active and 100x idle power savings). Other improvements include full-platform optimization via integrated display I/O interfaces.

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.

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