Power efficiency is a key requirement across a broad range of systems. From small mobile devices, to rack- mounted server farms, the success or failure of a product in its marketplace can be determined by its power efficiency.

For mobile devices power efficiency means increased battery life and a longer time between recharge. It enables selection of smaller batteries, possibly a different battery technology, and a corresponding reduction in product size. Power efficiency will also reduce thermal concerns, e.g., complications due to a mobile handset getting too hot to be placed next to the customer’s face.

For wired systems power efficiency will enable a reduction in power supply capacity, a reduction in cooling requirements and fan noise, a reduction in overall product costs, as well as reduction of total energy costs for the end customer. Power efficiency can allow an increase in component density as well. For example, a designer may be limited by the number of processors that can be placed on a board simply because the cumulative power consumption would exceed compliance limits for the corresponding bus specification. Increased component density can result either in increased capacity, a reduction in product size, or both.