“Green computers“ have been very trendy for several years now. In 2008 in Germany they experienced a break-through at the computer trade shows Cebit and Systems. Computers produce a lot of waste heat and need a lot of electricity for cooling and operating of processors, hard drives, monitors and printers. But it takes several years until the topic of trade shows becomes a topic for the masses. This is true for private users as well as for the retail market.