The PC consumes only 25w. That's not bad. If your office is lit by an 8w energy efficient bulb you're bringing in the whole working profess for less than a normal bulb.
It should cost you about 2p a day to run, that compares to 11p for a traditional PC which consumes 105w.
But the trouble is, USB. You know what it's like, you just keep plugging thing in. You have an external hard drive, a USB webcam, USB lead plugged into your digital camera and probably your phone too. And then, because you use so many USB devices you'll go out and by a UBS hub that plugs into the mains.
But still, if it runs cheaper you'll save money and that's all good.
They cost £599 though. And if it saves you 9p a day, it would take 3,333 days before it pays for the difference from a £299 machine. That's 9 years. And according to Al Gore the world will have ended by then.
[source]
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