Power draw is the last thing I'm worried about. Even if they are pushed to the limits from factory you can always down-volt and maintain 90% of performance while saving tons on wattage.I think it's a given that 4000 series will be massively more power efficient than 3000 series with the move from Samsung back to TSMC. People are saying they'll stay away because they'll be "power hungry", but that will only be if pushed to the limit. There will be more performance for less power, comfortably.