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