The problem isn't the power regulation or the cooling, but the fact that the chips run at way too low voltage to clock well at stock. People would claim the chip to be a "great clocker" if AMD bumped the voltage by some 0.075V, even though infact the chip itself wouldn't be any better - it would just have higher stock voltage to achieve higher clocks at stock.
I guess Nvidia and AMD balance the stock voltage and core speed quite accurately to meet the most optimal yield/power/performance/temperature ratios, and the top bins go to low-voltage mobile products.
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