Intel will most likely have no advantage in usable performance on the The 12, 14, 16, and, 18 chips they use too much power and run way to hot so they will need lower clocks. The Ryzen 1950X will most likely clock around 4 Ghz on air on all cores, The 12, 14, 16, and, 18 core intel chips, will need a custom loop, or really low clocks, intel like's to do fuckery and, the only way i can see them making the The 12, 14, 16, and, 18 chips have good performance is too turbo up 4 or 6 cores for gaming etc.
Last I heard silicon based was getting close to 25% efficiency. So for the same amount of energy of a square meter of a traditional panel, you'd need 10 square meters. That's a huge solar panel for only a regular amount of energy. I assume they'll continue to get more efficient though, maybe in a few years it'll be worth it.