I don't think so. AFAIK, ARM performs well in computation/watt on the low end of computation. But you have to get above a certain performance level to amortize

I don't think so. AFAIK, ARM performs well in computation/watt on the low end of computation. But you have to get above a certain performance level to amortize the power overhead of the rest of the computer (motherboard, ram, etc). But that's mostly a guess.