and computers often have a relatively short lifespan, energy and materials involved in production, distribution, disposal and recycling often make up significant portions of their cost, energy use, and environmental impact. Energy required for climate control of the computer's surroundings is often not counted in the wattage calculation, but it can be significant. Other energy efficiency measures SWaP (space, wattage and performance) is a Sun Microsystems metric for data centers, incorporating power and space: Where performance is measured by any appropriate benchmark, and space is size of the computer. Reduction of power, mass, and volume is also important for spaceflight computers. See also Energy efficiency benchmarks Average CPU power (ACP) a measure of power consumption when running several standard benchmarks EEMBC EnergyBench SPECpower a benchmark for web servers running Java (Server Side Java Operations per Joule) Other Data center infrastructure efficiency (DCIE) Energy proportional computing GeForce 9 series for GPU list, with energy use and theoretical FLOPS IT energy management Koomey's law Landauer's principle Low-power electronics Power usage effectiveness (PUE) Processor power dissipation Notes and references Further reading External links The Green500 Benchmarks (computing) Computers and the environment Electric power Energy conservation Computer performance