Disabling two cores might be allowing the CPU to use turbo boost more on the remaining cores as well as it is based on thermal headroom for the whole chip I believe. I normally just limit max CPU to 75% in the power settings for when using battery and that gives a little longer time on battery. I don't find it hugely slower even when using Visual Studio. Also never hear the fan on battery either on my T430.
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It appeared that disabling 2 cores sent the remain 2 cores' temp skyrocketting for some reason. So I'm back on 4 cores. Not sure if the power consumption will be altered but the fans drove me berserk.
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