Performance per Watt is pretty straight forward when you first look at it. Then you begin to sink in the quicksand you’ve blithely walked into. The panic sets in as you sink lower and lower. Eventually you decide to ignore the whole complicated mess and go back to saying to yourself how straight forward it is. Of course, deep within your heart of hearts, you know that it’s not.
For most of us, performance per Watt is nothing more than how much our computer can get done on a given battery charge.
[apologies gentle readers if you've seen this twice. I've moved this over from my mysterious twin account (taylor-kidd-2) over to this account (taylor-kidd)]
[Warning: Math and physics alert! Math and physics alert!]
I think that you've all seen this equation before:
P = a * C * V2 * f
Where P is power, C is capacitance, V is the voltage across the gate (typically, Vdd), f is the clock frequency, and a is some constant.