I had an Exynos 5422, and when it came out it was a great card, however, nowadays, it's old generation - it consumes more and it's less performing than the latest archictures (A7x).

"Double the cores" is not a valid consideration - 4+ core configurations typically have 2/4 cores (the 5422 has 4) with a high-powered architecture, and the remainder with a low powered one.

Compare for example the XU4 with the N2 - the N2 is more powerful, and yet, it has less cores (4 hp. + 2 lp.) and requires no fan.

The RPi is an interesting configuration - they have 4 high-powered architecture cores (4x A72) only. It seems it doesn't require any fan.

Of course if one requires specific chipset/components, we're talking about specific use cases, which is another story.