If I am to believe what TriEclipse has been propagandizing (

), your system would run at much less than those 400 Watts. The card you're getting is still relatively weak, good value for money perhaps but there are many bigger monsters out there. And I can't imagine it eats too much energy. If it's a build you bought at some store that had a motherboard in it that supports the card you're getting, I'd think that they put in an adequate PSU to match. Unless you've got a Dell like me. o_O