能耗问题 10000 1000 R⊙ cket Noz 100 Nuclear Reactor 10 Hot Plate 96199200020 Power Density Becomes Too High to Cool Chips inexpensively Moores Law Extrapolation Potential power density reaching amazing levels Flip side: Battery life very important Moore's law can yield more functionality at equivalent (or less) total energy consumption能耗问题