Up to 190W I read somewhere on their page. So it is similar to a Mac G5 or Mac Pro (around 200 W and more). What is a typical PC then? Office one? THey use less. Gamer PC? Some graphics card need 200 W and then you can add all other components. You can end up at 500 or 750 W for that. For a standard desktop usually 50 - 100 W. But if we could so much power like from this machine I would accept 190 W as well. Just not for a 10 year old G5 with tiny performance compared to that.