What's 80 Plus? Glad you asked!

An 80 Plus power supply converts at least 80 percent of the energy it draws into usable power for a computer's components. You may not be aware, but most power supplies aren't nearly as efficient, meaning that they leave a lot of power on the table. And that adds up to a lot of wasted electricity.

EcoGeek reports that Dell is popping pricier 80 Plus power supplies (there's always a catch) into Optifast 740 and 745 models, with more on the way. They also ship with energy saving features enabled by default.

Of course, you may not want to buy a new Dell. No worries there either. For a look at an aftermarket option, check out this SysOpt.com review of the Antec EarthWatts 500.