I believe the TDP of 45W is only when the processor is running at its base speed, which I suspect is not going to be any higher than the previous 2 or 3 generations of Intel's mobile chip of similar class. Now even if a single core can hit 5.3Ghz, the power draw would have exceeded 45W for sure. Considering an all core 5Ghz on the desktop chip and it is drawing north of 250W, getting even a single chip to hit 5.3Ghz (although only 300Mhz difference) likely requires significant increase in power. To hit the advertised single core speed is also subjected to the cooling capability of the laptop. Most 45W mobile CPUs are hitting over 90 degs easily and throttling, so not sure how long it can hold a single core at 5.3Ghz.
I do feel that Intel is pushing the aged Skylake architecture and 14nm to its max or even beyond max. I don't think they have ever intended for this to require that much power and to run at this sort of clockspeed in the first place. No matter what they do, if they are not able to get their 10nm out in full force (which I doubt), there is absolutely no way they can compete with AMD in the short run. This overclocking tactic is just so that can still hold on to the single core advantage, but if you look deeper beyond the clockspeed, it is absolutely inefficient when compared to the 7nm AMD chip. I also have doubts about the longevity of the chip considering the amount of power required and heat generated.
I do feel that Intel is pushing the aged Skylake architecture and 14nm to its max or even beyond max. I don't think they have ever intended for this to require that much power and to run at this sort of clockspeed in the first place. No matter what they do, if they are not able to get their 10nm out in full force (which I doubt), there is absolutely no way they can compete with AMD in the short run. This overclocking tactic is just so that can still hold on to the single core advantage, but if you look deeper beyond the clockspeed, it is absolutely inefficient when compared to the 7nm AMD chip. I also have doubts about the longevity of the chip considering the amount of power required and heat generated.