Originally Posted by lordikon
They do obey the laws. Not all energy becomes heat, you put 200w of energy into a GPU and you'll get some heat back, as well as work done (which isn't heat).
I believe the first law of thermodynamics would be the important one in this case.
Correct, but you said "a lot" of energy will go to the work done.
The 'work done' is the data signals (DVI/PCIe lane signals, etc) - it's not going to be a lot of energy. How many watts does it take to send a bitstream down a DVI cable? It's going to be a stupidly insignificant portion of the total wattage. Unless one wants to be pedantic, when you put 200W into a GPU you do essentially get it all back in heat.