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Even 'low-end' processors are hitting one gigahertz now:
The original Spitfire Duron had a transistor count of 25 million. The new Morgan Duron has 25.18 million. These 180,000 extra transistors come from the added hardware pre-fetch and SSE instructions. This leads to an overall increase in die size of 6 mm^2, to 106mm^2. The increase in size and speed without a decrease in the process used leads to an increase in power and heat, of course. In this case, the Duron 1000 has a typical power dissipation of 41.2 watts, versus 37.2 watts for the Duron 950.
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