PS3 Slim uses half the power of old SKU
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Basically, PS3 Slim uses about half the power of of the "old" machine. We know, because Crave's tested it. And we believe Crave. Because there's no reason not to.
Look how green Sony is, eh? Read that article, then go and buy one. Or two. You could buy two, run them side-by-side and be ruining the environment just as much as you were before. Awesome.