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clock gating
Last modified: Wednesday, December 29, 2004 

Clock gating is one of the power-saving techniques used on the Pentium 4 processor. To save power, clock gating refers to activating the clocks in a logic block only when there is work to be done. From the earliest days of the Pentium 4 processor design, power consumption was a concern. The clock gating concept isn't a new one; however, the Pentium 4 processor used this technology to a large extent. Every unit on the chip has a power reduction plan, and almost every Functional Unit Block (FUB) contains clock gating logic.

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Intel Technology Journal 
Managing the Impact of Increasing Microprocessor Power Consumption

Pentium 4 Technology Explained
Detailed explanation of the new design features of the Pentium 4 microprocessor.

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