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Old 05-04-2008, 01:50 PM   #1
LXer
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LXer: Temperature and CPU Frequency Control with Linux


Published at LXer:

Modern CPU's can be power-hungry beasts, and they can also run quite hot. Take, for example, the highest speed offerings from both Intel and AMD. Intel's 3.0 Gigahertz Yorkfield Quad-core is rated to consume about 130 Watts of power, while AMD's 3.0 Gigahertz 6000+ Dual-core is rated to consume about 125 Watts. Fortunately, modern processors from both companies now include a power-saving technology known as CPU Frequency Scaling. So, when super-high speeds aren't needed, the frequency will get scaled back, so that the CPU consumes less power and runs cooler. (AMD's implementation of this is called Cool n' Quiet, and Intel's implementation is called SpeedStep.) This is all supposed to happen automatically, but there may be times when you'll want to control it manually. Here's one example of why.

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