This is why there is a huge difference between 8-gen or greater Intel CPUs on mobile. As of 7th gen, the only mobile CPUs that had quad-core were the HQ-series

This is why there is a huge difference between 8-gen or greater Intel CPUs on mobile. As of 7th gen, the only mobile CPUs that had quad-core were the HQ-series 45W TDPs which required a totally different cooling design. Then, with 8th gen, all the regular low-TDP CPUs got quad core and the 45Ws started offering six-core. For example, the only ThinkPad of that generation's T-series that had one was the T470p which had a significantly different design in terms of batteries, thunderbolt features, etc. to accommodate the significantly larger cooling system. With the very next year's model, all the models got quad-core with their usual low-voltage/low-power (and low battery usage) design.