It'll pull a bit more power than the March $500 gaming buildhttp://www.tomshardware.com/reviews/budget-gaming-pc-phenom-ii-radeon-hd-6850,2903.html
Take note that the overclocked Dec. system draws about 4 more amps ( same psu )
And keep in mind that they are running Prime and Furmark to come up with the max power draw, a good deal more power than would normally be drawn.
So, if you don't intend to run Prime and Furmark 24/7 it should be fine.
Would it be optimal ?
No, but it's not a perfect world, is it ?