http://www.bbc.co.uk/news/business-16858088
If you use a notebook you need to be aware of the size of your AC adapter as well. If the processor uses Speedstep technology then it may not run at full throttle if the adapter cannot get enough wattage. So then the processor is throttled so it doesn’t have thermal issues because there isn’t enough current to drive the processor. On Dell’s they actually run at slower speeds and the battery does not charge. A sure indication that your are in a low voltage environment.
From Dell’s documentation.
The AC power adapter wattage and type cannot be determined. the battery may not charge. they system will adjust the performance to match the power available. please connect a dell xxx-W AC adapter or greater for best system performance. strike the F3 key (before the F1 or F2 key) if you do not want to see power warning messages again. strike the F1 key to continue, F2 to run the setup utility.
