I was referring to things that actually use power. Also I am assuming that a balanced system is being used. For example if your already spending all the money for two gpus I would assume that you would also water cool them for overclock as to extend the lifetime and thus value of the investment. I also assume that you are going to run two high end cards becuase while you can take advantage of two low cards to be a bit better than one top end card this is not the case for every environment. Also I can say that you are pushing that psu close to its limit and run the rick of needing a new psu in the future. Remember to that as you get close to the limit you also decrease in conversion efficiency and as a result waste more money. I have been using 500+w systems for over 5 years. The benefit is that they can still be used and that is why when I needed a new psu for my tv computer I got a 910w so I would be ready for anything down the road.