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"available on 4.77 MHz 8088s). While it is waiting, the processor's clock could be slowed down (unless it has a governor on it that prevents its clock speed from being changed !?) and it would thus draw less power. So a cool case *could* be a sign of *better* engineering." Well this is of course an available power saving setting on the thinkpad, and yes, as you guess, the case runs cooler when you use this option, as you would expect. The power saving option that you talk about subjunctively is called Automatic Clock Control. Set the processor speed to the minimum, and set Automatic Clock Control on, and you will get exactly the effect you describe.