KatjaGrace comments on Superintelligence Reading Group - Section 1: Past Developments and Present Capabilities - Less Wrong
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"How much smarter than a human could a thing be?" - almost infinitely if it consumed all of the known universe
"How about the same question, but using no more energy than a human?" -again the same answer - assuming we assume intelligence to be computable, then no energy is required (http://www.research.ibm.com/journal/rd/176/ibmrd1706G.pdf) if we use reversible computing. Once we have an AI that is smarter than a human then it would soon design something that is smarter but more efficient (energy wise)?
Anders Sandberg has some thoughts on physical limits to computation which might be relevant, but I admit I haven't read them yet: http://www.jetpress.org/volume5/Brains2.pdf