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If the XScale has ANY kind of cooling, it could only be in the form of small heat sinks. (LOL) You are going to use more power on any processor you overclock. It is the reverse effect of switching your 400MHz Axim to the 200MHz setting.
For example, you can easily almost double the speed of a TI-86 calculator by switching out a capacitor on the circut board. But the reason TI didn't do that is because it used more battery power and would reduce the usage time. It also may not be good for the processor, but that isn't my point.
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