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Cooling limitations are extremely applicable to laptops! You can easily have two different machines with identical CPUs and 10%+ performance difference because one has a proper cooling system while the other doesn't. Check the notebookcheck rankings if you want to see some specific numbers.

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Sorry, I meant that in the sense that no laptop is "properly cooled". There definitely can still be variations. :P

That's not actually true! From https://www.notebookcheck.net/Lenovo-ThinkPad-T470-Core-i5-F...:

"Our stress test with the tools Prime95 and FurMark (at least one hour) on mains is not a big challenge for the ThinkPad T470. Thanks to the increased TDP limit, both components can maintain their maximum respective clocks over the course of the review. [...] The two CPU cores maintain the full Turbo Boost at 3.1 GHz and the graphics card 998 MHz."

Also, this will only further increase the value of maintainable machines. A machine with good and accessible/serviceable cooling means that redoing the thermal paste after 3-4 years will be both feasible and helpful.

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