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Now, as the fab size decreases, the "efficiency" of the CPU increases. So, if we assume two processors which are designed exactly the same except that one of them is scaled down to 14nm while the other is at 28nm, the 14nm processor will be able to:
Perform at least as fast as the higher fab size CPU;
Do so using less power;
Do so while dissipating less heat;
Do so using a smaller volume in terms of the physical size of the chip.
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Generally, when companies like Intel and the ARM-based chip manufacturers (Samsung, Qualcomm, etc) decrease fab size, they also tend to ramp up the performance a bit. This puts a hamper on exactly how much power efficiency they can gain, but everyone likes their stuff to run faster, so they design their chips in a "balanced" way, so that you get some power efficiency gains, and some performance gains.
On the other extremes, they could keep the processor exactly as power-hungry as the previous generation, but ramp up the performance a lot; or, they could keep the processor exactly at the same speed as the previous generation, but reduce the power consumption by a lot.
The main point to consider is that the current generation of tablet and smartphone CPUs has a TDP around 2 to 4 Watts and a fab size of 28 nm. A low-end desktop processor from 2012 has a TDP of at least 45 Watts and a fab size of 22 nm.
Nu stiu pe ce isi bazeaza afirmatia, numai cineva foarte bine documentat in domeniul asta ar putea confirma sau infirma, dar daca e adevarat ar explica premisa:
MHz / GHz and number of cores are no longer a reliable indicator of the relative performance of any two arbitrary processors.
Si btw, informatia asta e targetata pe procesoarele mobile, pentru ca la procesoarele PC piata e destul de stabila si testata, in schimb la mobile se arunca cu frecvente si numere in toate partile si e mai greu de stiut daca acele numere chiar reflecta performanta reala.