They don't really need to - the relationship between transistor switching speed and temperature is very well-understood. You only need to evaluate the speed at a couple temperature points to be able to extrapolate behavior at any temperature. The silicon will then run optimally at whatever temperature it happens to be at.
True, you could always throw in better cooling and watch the chip clock itself sky-high. But that is also a problem that is solved by simply spending more money.





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