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At this point I might as well mention thermal throttling. When a cpu or gpu reaches it's thermal limit, the first resort is to turn the fans up, if that doesn't keep it cool, it will reduce the multiplier, if that doesn't work it will shut off. Macbooks and ultrabooks are notorious for this. You get 100% performance for 30 seconds and then it will downclock because the heatsink cannot keep up with the heat output. So I lied about performance, however you will get this with every ultrabook. You can only combat this with size.
T420 heatsink:
[img] [/img]
macbook:
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