CPUThermal

The same idea would work for CPU's and GPU's. A 10% energy savings for server farms would be pretty huge.

Ironically, energy saving technologies (like the currently expanding use of fluorescent bulbs and solid-state lighting) might increase their marginal utility (i.e., lowering their cost enough to enable many new applications they were previously too expensive to use, or if we've already hit saturation, by enabling poorer countries to use them in the same way we do now) and so increase the total energy usage.